build: revert strtold workarounds — GCC cstdlib fix is the root fix

Remove per-package workarounds that were needed before the root-cause
fix in mk/prefix.mk (which adds #include <stdlib.h> to GCC's <cstdlib>
header at prefix build time). The cstdlib fix makes strtold visible
globally, so per-recipe -include stdlib.h and P1-*.patch are redundant.

Reverted:
- redox-toolchain.cmake: removed -include stdlib.h and PCH disable
- kf6-ki18n: restored full build (removed stub recipe + P1 patch)
- kf6-ki18n: removed ECM version sed (ECM bumped to 6.11.0 already)
- redbear-greeter: removed #include <stdlib.h> workarounds in source
- local/patches/kf6-ki18n/: removed unused P1 patch directory

local/patches/kf6-ki18n/P1-strtold-include.patch

@@ -1,13 +0,0 @@
---- a/src/i18n/common_helpers_p.h
-+++ b/src/i18n/common_helpers_p.h
-@@ -7,6 +7,10 @@
- #ifndef COMMON_HELPERS_P_H
- #define COMMON_HELPERS_P_H
- 
-+// Ensure C99 stdlib declarations (strtold etc.) are visible before
-+// Qt headers pull in <cstdlib>. relibc declares strtold via cbindgen
-+// trailer; GCC <cstdlib> needs it in :: scope.
-+#include <stdlib.h>
- #include <QString>
- 
- // Standalone (pure Qt) functionality needed internally in more than

local/recipes/kde/kf6-ki18n/P1-strtold-include.patch

@@ -1 +0,0 @@
-../../../../local/patches/kf6-ki18n/P1-strtold-include.patch

local/recipes/kde/kf6-ki18n/recipe.toml

@@ -1,9 +1,6 @@
 #TODO: KI18n — internationalization framework, gettext integration. Depends on qtbase, qtdeclarative, kf6-extra-cmake-modules.
 [source]
 tar = "https://invent.kde.org/frameworks/ki18n/-/archive/v6.10.0/ki18n-v6.10.0.tar.gz"
-patches = [
-    "P1-strtold-include.patch",
-]
 
 [build]
 template = "custom"
@@ -20,30 +17,42 @@ source "${COOKBOOK_ROOT}/local/scripts/lib/qt-sysroot.sh"
 
 redbear_qt_link_sysroot_dirs "${COOKBOOK_SYSROOT}" plugins mkspecs metatypes modules
 
-# Build a minimal cmake-only package. Actual i18n library blocked by
-# strtold visibility (GCC <cstdlib> ::strtold not found in relibc).
-# This provides KF6I18nConfig.cmake so dependents can configure.
+# ECMGenerateQDoc requires Qt6Tools which we don't build. Remove.
+find "${COOKBOOK_SOURCE}" -name "CMakeLists.txt" -exec sed -i '/include(ECMGenerateQDoc)/d; /ecm_generate_qdoc/d' {} +
+# ki18n_install(po) tries to build translation files; skip for cross-compile.
+sed -i 's/^ki18n_install(po)/#ki18n_install(po)/' \
+    "${COOKBOOK_SOURCE}/CMakeLists.txt" 2>/dev/null || true
+# i18n-qml is needed by KNewStuffWidgets. Disable localedata-qml (runtime data unpackage).
+sed -i 's/^#    add_subdirectory(i18n-qml)/    add_subdirectory(i18n-qml)/' \
+    "${COOKBOOK_SOURCE}/src/CMakeLists.txt" 2>/dev/null || true
+sed -i 's/^    add_subdirectory(localedata-qml)/#    add_subdirectory(localedata-qml)/' \
+    "${COOKBOOK_SOURCE}/src/CMakeLists.txt" 2>/dev/null || true
 
-mkdir -p "${COOKBOOK_STAGE}/usr/lib/cmake/KF6I18n"
-cat > "${COOKBOOK_STAGE}/usr/lib/cmake/KF6I18n/KF6I18nConfig.cmake" << 'CMEOF'
-set(KF6I18n_VERSION "6.10.0")
-set(KF6I18n_FOUND TRUE)
-include("${CMAKE_CURRENT_LIST_DIR}/KF6I18nTargets.cmake")
-CMEOF
-cat > "${COOKBOOK_STAGE}/usr/lib/cmake/KF6I18n/KF6I18nTargets.cmake" << 'CMEOF'
-if(NOT TARGET KF6::I18n)
-    add_library(KF6::I18n SHARED IMPORTED)
-    set_target_properties(KF6::I18n PROPERTIES
-        IMPORTED_LOCATION "${CMAKE_CURRENT_LIST_DIR}/../../libKF6I18n.so"
-    )
-endif()
-CMEOF
-cat > "${COOKBOOK_STAGE}/usr/lib/cmake/KF6I18n/KF6I18nConfigVersion.cmake" << 'CMEOF'
-set(PACKAGE_VERSION "6.10.0")
-set(PACKAGE_VERSION_COMPATIBLE TRUE)
-set(PACKAGE_VERSION_EXACT TRUE)
-CMEOF
-# Create a stub .so for package dependency resolution
-mkdir -p "${COOKBOOK_STAGE}/usr/lib"
-touch "${COOKBOOK_STAGE}/usr/lib/libKF6I18n.so"
-"""
+rm -f CMakeCache.txt
+rm -rf CMakeFiles
+
+export LDFLAGS+=" -liconv"
+
+cmake "${COOKBOOK_SOURCE}" \
+    -DCMAKE_TOOLCHAIN_FILE="${COOKBOOK_ROOT}/local/recipes/qt/redox-toolchain.cmake" \
+    -DQT_HOST_PATH="${HOST_BUILD}" \
+    -DCMAKE_INSTALL_PREFIX=/usr \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_PREFIX_PATH="${COOKBOOK_SYSROOT}" \
+    -DCMAKE_C_STANDARD_LIBRARIES="-liconv" \
+    -DCMAKE_CXX_STANDARD_LIBRARIES="-liconv" \
+    -DCMAKE_SHARED_LINKER_FLAGS="-liconv" \
+    -DCMAKE_EXE_LINKER_FLAGS="-liconv" \
+    -DBUILD_TESTING=OFF \
+    -DBUILD_QCH=OFF \
+    -DBUILD_WITH_QML=ON \
+    -Wno-dev
+
+cmake --build . -j${COOKBOOK_MAKE_JOBS}
+cmake --install . --prefix "${COOKBOOK_STAGE}/usr"
+
+for lib in "${COOKBOOK_STAGE}/usr/lib/"libKF6*.so.*; do
+    [ -f "${lib}" ] || continue
+    patchelf --remove-rpath "${lib}" 2>/dev/null || true
+done
+"""

local/recipes/qt/redox-toolchain.cmake

@@ -42,13 +42,10 @@ set(CMAKE_SYSTEM_VERSION 1)
 
 # Redox userspace currently must not emit CET/IBT entry instructions (endbr64),
 # because they trap as invalid opcode in the current runtime stack.
-set(CMAKE_C_FLAGS "-fcf-protection=none -march=x86-64 -include strings.h -include stdlib.h" CACHE STRING "" FORCE)
-set(CMAKE_CXX_FLAGS "-fcf-protection=none -march=x86-64 -fpermissive -include strings.h -include stdlib.h -I${COOKBOOK_SYSROOT}/usr/include/QtQml -I${COOKBOOK_SYSROOT}/usr/include/QtQuick" CACHE STRING "" FORCE)
-set(CMAKE_C_FLAGS_RELEASE "-fcf-protection=none -march=x86-64 -include strings.h -include stdlib.h" CACHE STRING "" FORCE)
-set(CMAKE_CXX_FLAGS_RELEASE "-fcf-protection=none -march=x86-64 -fpermissive -include strings.h -include stdlib.h" CACHE STRING "" FORCE)
-# Disable precompiled headers — PCH compiles without -include flags,
-# missing C99 stdlib declarations (strtold) needed by GCC <cstdlib>.
-set(CMAKE_DISABLE_PRECOMPILE_HEADERS ON CACHE BOOL "" FORCE)
+set(CMAKE_C_FLAGS "-fcf-protection=none -march=x86-64 -include strings.h" CACHE STRING "" FORCE)
+set(CMAKE_CXX_FLAGS "-fcf-protection=none -march=x86-64 -fpermissive -include strings.h -I${COOKBOOK_SYSROOT}/usr/include/QtQml -I${COOKBOOK_SYSROOT}/usr/include/QtQuick" CACHE STRING "" FORCE)
+set(CMAKE_C_FLAGS_RELEASE "-fcf-protection=none -march=x86-64 -include strings.h" CACHE STRING "" FORCE)
+set(CMAKE_CXX_FLAGS_RELEASE "-fcf-protection=none -march=x86-64 -fpermissive -include strings.h" CACHE STRING "" FORCE)
 
 # Flag for redox.patch: enables REDOX-specific CMake code paths (mkspec, QPA plugin).
 # QtPlatformSupport.cmake checks this variable. Set as CACHE INTERNAL so it persists

local/recipes/system/redbear-greeter/source/ui/greeter_backend.cpp

@@ -1,4 +1,3 @@
-#include <stdlib.h>
 #include "greeter_backend.h"
 
 #include <QByteArray>

local/recipes/system/redbear-greeter/source/ui/main.cpp

@@ -1,4 +1,3 @@
-#include <stdlib.h>
 #include <QGuiApplication>
 #include <QQmlApplicationEngine>
 #include <QQmlContext>