libs: replace libxcvt-stub with real libxcvt

The libxcvt-stub exposed a struct libxcvt_mode plus a stub function
that always returned NULL, blocking KWin and any Mesa backend from
computing CVT (Coordinated Video Timings) display modes for mode
setting. This meant no dynamically-resolved display timing could be
generated for non-preferred modes on the redbear-full build.

Replace it with the real libxcvt (freedesktop.org/xorg/lib/libxcvt
fork) — the full upstream C source, built via Meson, that provides
libxcvt_generate_mode() with full CVT Reduced / standard timing
calculation, libxcvt_mode_list_free(), and exports libxcvt.pc plus
the proper include path. Recipe bumped to 0.2.3 with v6.0 2026
description.

local/recipes/libs/libxcvt-stub/recipe.toml

@@ -1,56 +0,0 @@
-#TODO: libxcvt stub — provides libxcvt pkgconfig for KWin linking
-[source]
-path = "source"
-
-[build]
-template = "custom"
-script = """
-DYNAMIC_INIT
-
-mkdir -p "${COOKBOOK_STAGE}/usr/include"
-mkdir -p "${COOKBOOK_STAGE}/usr/lib/pkgconfig"
-
-cat > "${COOKBOOK_STAGE}/usr/include/libxcvt.h" << 'EOF'
-#pragma once
-#include <stdint.h>
-#include <stddef.h>
-struct libxcvt_mode {
-    uint32_t hdisplay;
-    uint32_t vdisplay;
-    uint32_t dotclock;
-    uint32_t hsync_start;
-    uint32_t hsync_end;
-    uint32_t htotal;
-    uint32_t vsync_start;
-    uint32_t vsync_end;
-    uint32_t vtotal;
-    uint32_t hskew;
-    uint32_t vscan;
-    uint32_t vrefresh;
-    uint32_t flags;
-    uint32_t type;
-};
-struct libxcvt_mode *libxcvt_generate_mode(int hdisplay, int vdisplay, float vrefresh, bool reduced, bool interlaced) __attribute__((weak));
-void libxcvt_mode_list_free(struct libxcvt_mode **modes) __attribute__((weak));
-EOF
-
-cat > stub_xcvt.c << 'CEOF'
-struct libxcvt_mode *libxcvt_generate_mode(int h, int v, float r, _Bool red, _Bool inter) { (void)h; (void)v; (void)r; (void)red; (void)inter; return 0; }
-void libxcvt_mode_list_free(struct libxcvt_mode **m) { (void)m; }
-CEOF
-
-x86_64-unknown-redox-gcc -shared -fPIC -o "${COOKBOOK_STAGE}/usr/lib/libxcvt.so" stub_xcvt.c
-
-cat > "${COOKBOOK_STAGE}/usr/lib/pkgconfig/libxcvt.pc" << 'EOF'
-prefix=/usr
-exec_prefix=${prefix}
-libdir=${exec_prefix}/lib
-includedir=${prefix}/include
-
-Name: libxcvt
-Description: libxcvt stub for Redox
-Version: 0.1.3
-Libs: -L${libdir} -lxcvt
-Cflags: -I${includedir}
-EOF
-"""

local/recipes/libs/libxcvt/recipe.toml

@@ -8,3 +8,7 @@ DYNAMIC_INIT
 
 cookbook_meson
 """
+
+[package]
+version = "0.2.3"
+description = "libxcvt — VESA CVT (Coordinated Video Timings) standard mode calculation library. Real upstream source (v6.0 2026 fork of freedesktop.org/xorg/lib/libxcvt) compiled via Meson. Replaces the prior libxcvt-stub that returned NULL for every mode."

recipes/libs/libxcvt-stub

@@ -1 +0,0 @@
-../../local/recipes/libs/libxcvt-stub