mesa: fork mainline recipe to local for EGL Wayland work (Phase 2.1)

The mainline recipes/libs/mesa/recipe.toml links against -lorbital
and uses -Dplatforms=redox — a deprecated Orbital-only path. For
the v6.0 console-to-desktop plan, Mesa must be switched to the
Wayland EGL platform (-Dplatforms=wayland + -lwayland-client) so
Qt6 eglfs can open a window under a Wayland compositor.

Create a Red Bear fork of the mainline recipe under
local/recipes/libs/mesa/ to receive the EGL Wayland changes
without modifying mainline directly. This recipe is currently
identical to upstream; subsequent commits will:

  - Remove -lorbital link flag and liborbital dep
  - Add wayland + libwayland-client deps
  - Switch -Dplatforms=redox to -Dplatforms=wayland
  - Verify EGL_KHR_platform_wayland loads in QEMU

Phase 2.1 of the v6.0 plan: 1 week effort.

local/recipes/libs/mesa/recipe.toml

@@ -0,0 +1,58 @@
+[source]
+git = "https://gitlab.redox-os.org/redox-os/mesa.git"
+upstream = "https://gitlab.freedesktop.org/mesa/mesa"
+branch = "redox-24.0"
+shallow_clone = true
+[build]
+template = "custom"
+dependencies = [
+    "expat",
+    "libdrm",
+    "liborbital",
+    "llvm21",
+    "zlib",
+]
+dev-dependencies = [
+    "llvm21.dev",
+]
+script = """
+DYNAMIC_INIT
+
+#TODO: Should be CPPFLAGS but cookbook_meson isn't reading it
+export CFLAGS+=" -DHAVE_PTHREAD=1 -I${COOKBOOK_SYSROOT}/include/libdrm"
+export LLVM_CONFIG="${TARGET}-llvm-config"
+if [ -x "${HOME}/.redoxer/${TARGET}/toolchain/bin/llvm-config" ]; then
+    export COOKBOOK_HOST_SYSROOT="${HOME}/.redoxer/${TARGET}/toolchain"
+fi
+export LDFLAGS+=" -lorbital"
+
+mkdir -p .cookbook-tools
+ln -sf "$(command -v "${LLVM_CONFIG}")" .cookbook-tools/llvm-config
+export PATH="$(pwd)/.cookbook-tools:${PATH}"
+
+if [ "${COOKBOOK_DYNAMIC}" == "1" ]; then
+    COOKBOOK_MESON_FLAGS+=(-Dshared-llvm=enabled)
+else
+    COOKBOOK_MESON_FLAGS+=(-Dshared-llvm=disabled)
+fi
+
+cookbook_meson \
+    -Ddri-drivers-path=/usr/lib/dri \
+    -Degl=enabled \
+    -Dgbm=enabled \
+    -Dglx=disabled \
+    -Dgallium-drivers=swrast,virgl,iris,crocus \
+    -Dllvm=enabled \
+    -Dosmesa=true \
+    -Dplatforms=redox \
+    -Dshader-cache=disabled \
+    -Dc_args="['-Wno-error=implicit-function-declaration','-Wno-error','-std=gnu11','-Dstatic_assert=_Static_assert']" \
+    -Dcpp_args="['-Wno-error=implicit-function-declaration','-Wno-error']" \
+    -Dvulkan-drivers=swrast \
+    -Dshared-glapi=enabled
+
+# Hack to add LLVM libs, the list can be seen from meson log and check for matches $("${LLVM_CONFIG}" --libs)
+LLVMLIBS="-lLLVMBitReader -lLLVMCore -lLLVMExecutionEngine -lLLVMInstCombine -lLLVMMCDisassembler" 
+LLVMLIBS+=" -lLLVMMCJIT -lLLVMScalarOpts -lLLVMTransformUtils -lLLVMCoroutines -lLLVMLTO"
+sed -i "s/ -lOSMesa / -lOSMesa ${LLVMLIBS} -lstdc++ /" "${COOKBOOK_STAGE}/usr/lib/pkgconfig/osmesa.pc"
+"""