Update Mesa to v26.0.3 with softpipe for all non-macOS platforms

- Update Mesa from v20.1.5 to v26.0.3 (latest stable)
- Add all Linux, FreeBSD, and Windows platforms (exclude macOS which provides OpenGL natively)
- Use softpipe software renderer (no LLVM dependency to avoid conflicts with Julia's LLVM)
- Require GCC 10+ for C++17 support (Mesa 26 requirement)
- Add X11 dependencies for Linux/FreeBSD

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ViralBShah

M/Mesa/build_tarballs.jl

@@ -3,41 +3,86 @@
 using BinaryBuilder, Pkg
 
 name = "Mesa"
-version = v"20.1.5"
+version = v"26.0.3"
 
 # Collection of sources required to complete build
 sources = [
-    ArchiveSource("https://archive.mesa3d.org/mesa-$version.tar.xz", "fac1861e6e0bf1aec893f8d86dbfb9d8a0f426ff06b05256df10e3ad7e02c69b"),
+    ArchiveSource("https://archive.mesa3d.org/mesa-$version.tar.xz",
+                  "ddb7443d328e89aa45b4b6b80f077bf937f099daeca8ba48cabe32aab769e134"),
 ]
 
 # Bash recipe for building across all platforms
 script = raw"""
-mkdir build
-cd build
-apk add py3-mako
-meson -D b_ndebug=true -D buildtype=release -D strip=true -D llvm=false ../mesa* --cross-file="${MESON_TARGET_TOOLCHAIN}"
-ninja -j${nproc}
-ninja install
-mv $prefix/bin/opengl32.dll $prefix/bin/opengl32sw.dll
-install_license ../mesa*/docs/license.html
+cd $WORKSPACE/srcdir/mesa-*
+
+apk add py3-mako py3-yaml py3-packaging
+
+MESA_FLAGS=(
+    -D b_ndebug=true
+    -D buildtype=release
+    -D strip=true
+    -D llvm=disabled
+    -D gallium-drivers=softpipe
+    -D vulkan-drivers=[]
+    -D gles1=disabled
+    -D gles2=disabled
+    -D shader-cache=disabled
+)
+
+if [[ "${target}" == *-mingw* ]]; then
+    MESA_FLAGS+=(
+        -D platforms=windows
+        -D glx=disabled
+        -D egl=disabled
+        -D gbm=disabled
+    )
+elif [[ "${target}" == *-linux* ]] || [[ "${target}" == *-freebsd* ]]; then
+    MESA_FLAGS+=(
+        -D platforms=x11
+        -D glx=xlib
+        -D egl=disabled
+        -D gbm=disabled
+    )
+fi
+
+meson setup build "${MESA_FLAGS[@]}" --cross-file="${MESON_TARGET_TOOLCHAIN}"
+ninja -C build -j${nproc}
+ninja -C build install
+
+if [[ "${target}" == *-mingw* ]]; then
+    mv ${prefix}/bin/opengl32.dll ${prefix}/bin/opengl32sw.dll
+fi
+
+install_license docs/license.rst
 """
 
 # These are the platforms we will build for by default, unless further
 # platforms are passed in on the command line
-platforms = [
-    Platform("x86_64", "windows"),
-    Platform("i686", "windows")
-]
+platforms = supported_platforms()
+# macOS provides OpenGL natively; Mesa doesn't produce a GL library without X11/GLX
+filter!(p -> !Sys.isapple(p), platforms)
+platforms = expand_cxxstring_abis(platforms)
 
 # The products that we will ensure are always built
 products = [
-    LibraryProduct("opengl32sw", :opengl32sw; dont_dlopen=true)
+    LibraryProduct(["opengl32sw", "libGL"], :libmesaGL),
 ]
 
 # Dependencies that must be installed before this package can be built
+x11_platforms = filter(p -> Sys.islinux(p) || Sys.isfreebsd(p), platforms)
 dependencies = [
-  Dependency("Zlib_jll")
+    Dependency("CompilerSupportLibraries_jll"),
+    Dependency("Zlib_jll"; compat="1.2.12"),
+    Dependency("Expat_jll"; platforms=x11_platforms),
+    Dependency("Xorg_libX11_jll"; platforms=x11_platforms),
+    Dependency("Xorg_libXext_jll"; platforms=x11_platforms),
+    Dependency("Xorg_libxcb_jll"; platforms=x11_platforms),
+    Dependency("Xorg_xorgproto_jll"; platforms=x11_platforms),
+    Dependency("Xorg_libxshmfence_jll"; platforms=x11_platforms),
+    Dependency("Xorg_libXrandr_jll"; platforms=x11_platforms),
+    Dependency("Xorg_libXxf86vm_jll"; platforms=x11_platforms),
 ]
 
-# Build the tarballs, and possibly a `build.jl` as well.
-build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies)
+# Build the tarballs.
+build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies;
+               julia_compat="1.6", preferred_gcc_version=v"10", clang_use_lld=false)