delete mesa-gcc overlay

overlays/mesa-gcc/default.nix

@@ -1,38 +0,0 @@
-{ ... }:
-
-final: prev: {
-  mesa = (prev.mesa.overrideAttrs (old: rec {
-    version = "git-unstable-2026-05-07";
-    src = prev.fetchFromGitLab {
-      domain = "gitlab.freedesktop.org";
-      owner = "mesa";
-      repo = "mesa";
-      rev = "0f75fa5bfd29770128a412f1fcf5c4121f95e1bb";
-      hash = "sha256-9sqgro3Y+yctcueHEO0hNmySLNn9F1HP3lPqcIow0+k=";
-    };
-    patches = [];
-    buildInputs = old.buildInputs ++ (with prev.llvmPackages_21; [ 
-      clang-unwrapped
-      libclang
-    ]);
-    
-    # Create symlinks to clang libraries so meson can find them
-    preConfigure = (old.preConfigure or "") + ''
-      mkdir -p $NIX_BUILD_TOP/clang-libs
-      for lib in ${prev.llvmPackages_21.clang-unwrapped.lib}/lib/*.a; do
-        ln -sf "$lib" "$NIX_BUILD_TOP/clang-libs/"
-      done
-      export LIBRARY_PATH="$NIX_BUILD_TOP/clang-libs:''${LIBRARY_PATH:-}"
-      export CXXFLAGS="$CXXFLAGS -fno-strict-aliasing"
-    '';
-    
-    mesonFlags = 
-      (builtins.filter (flag: 
-        !(prev.lib.hasPrefix "-Dclang-libdir=" flag) &&
-        flag != "--sysconfdir=/etc"
-      ) old.mesonFlags) ++ [
-      "-Dsysconfdir=${placeholder "out"}/etc"
-    ] ++ (if prev.stdenv.hostPlatform.is64bit then [ "-Dintel-rt=enabled" ] else [ "-Dintel-rt=disabled" ]);
-  }));
-}
-