fix: resolve qtdeclarative sysroot propagation failures

Three build failures (qt6-sensors, sddm, kwin) all trace to
qtdeclarative's sysroot/ directory being missing after staging.
CMake config files reference absolute paths into that sysroot.

1. qt-sysroot.sh: add mkdir -p before ln -sf in
   redbear_qt_ensure_dep_sysroots() so the parent directory is
   created when the dependency sysroot was cleaned up.

2. sddm wayland-patch.sh: fix sed pattern to include LinguistTools
   token that exists in the actual upstream CMakeLists.txt line.
   Without it the sed silently fails to match, leaving
   LinguistTools/Test/QuickTest as REQUIRED components.

3. qt6-sensors recipe.toml: source qt-sysroot.sh and call
   redbear_qt_ensure_dep_sysroots() before cmake configure.
   Previously the recipe only symlinked plugins/mkspecs/metatypes/
   modules but never fixed up dependency sysroot paths, causing
   Qt6::Qml INTERFACE_INCLUDE_DIRECTORIES to reference a
   non-existent include path.

local/recipes/kde/sddm/wayland-patch.sh

@@ -39,7 +39,7 @@ if [ -f "$SRC/cmake/FindXKB.cmake" ]; then
 fi
 
 if [ -f "$SRC/CMakeLists.txt" ]; then
-    sed -i 's/find_package(Qt\${QT_MAJOR_VERSION} 5.15.0 CONFIG REQUIRED Core DBus Gui Qml Quick Test QuickTest)/find_package(Qt\${QT_MAJOR_VERSION} 5.15.0 CONFIG REQUIRED Core DBus Gui Network Qml Quick)/' "$SRC/CMakeLists.txt"
+    sed -i 's/find_package(Qt\${QT_MAJOR_VERSION} 5.15.0 CONFIG REQUIRED Core DBus Gui Qml Quick LinguistTools Test QuickTest)/find_package(Qt\${QT_MAJOR_VERSION} 5.15.0 CONFIG REQUIRED Core DBus Gui Network Qml Quick)/' "$SRC/CMakeLists.txt"
     sed -i '/find_package(Qt\${QT_MAJOR_VERSION} 5.15.0 CONFIG REQUIRED Core DBus Gui Network Qml Quick)/a find_package(Qt\${QT_MAJOR_VERSION} 5.15.0 CONFIG OPTIONAL_COMPONENTS LinguistTools Test QuickTest)' "$SRC/CMakeLists.txt"
 fi
 

local/recipes/qt/qt6-sensors/recipe.toml

@@ -15,11 +15,9 @@ DYNAMIC_INIT
 
 HOST_BUILD="${COOKBOOK_ROOT}/build/qt-host-build"
 
-for qtdir in plugins mkspecs metatypes modules; do
-    if [ -d "${COOKBOOK_SYSROOT}/usr/${qtdir}" ] && [ ! -e "${COOKBOOK_SYSROOT}/${qtdir}" ]; then
-        ln -s "usr/${qtdir}" "${COOKBOOK_SYSROOT}/${qtdir}"
-    fi
-done
+source "${COOKBOOK_ROOT}/local/scripts/lib/qt-sysroot.sh"
+redbear_qt_prepare_common_sysroot "${COOKBOOK_SYSROOT}"
+redbear_qt_ensure_dep_sysroots "${COOKBOOK_ROOT}" "${COOKBOOK_SYSROOT}"
 
 rm -f CMakeCache.txt
 rm -rf CMakeFiles

local/scripts/lib/qt-sysroot.sh

@@ -155,6 +155,7 @@ redbear_qt_ensure_dep_sysroots() {
             if [ -L "${dep_sysroot}/lib" ] || [ -e "${dep_sysroot}/lib" ]; then
                 rm -rf "${dep_sysroot}/lib"
             fi
+            mkdir -p "${dep_sysroot}"
             ln -sf "${sysroot}/usr/include" "${dep_sysroot}/include"
             ln -sf "${sysroot}/usr/lib" "${dep_sysroot}/lib"
         fi