mesa: disable withValgrind if valgrind-light is marked as broken

`valgrind` derivation is currently marked as broken in either:
- `stdenv.isDarwin`
- `stdenv.hostPlatform.isStatic`

Instead of adding those two checks in the `mesa` derivation, we can just
check the current `valgrind-light.meta.broken` attribute.

pkgs/development/libraries/mesa/default.nix

@@ -9,7 +9,7 @@
 , vulkanDrivers ? ["auto"]
 , eglPlatforms ? [ "x11" ] ++ lib.optionals stdenv.isLinux [ "wayland" ]
 , OpenGL, Xplugin
-, withValgrind ? !stdenv.isDarwin && lib.meta.availableOn stdenv.hostPlatform valgrind-light, valgrind-light
+, withValgrind ? lib.meta.availableOn stdenv.hostPlatform valgrind-light && !valgrind-light.meta.broken, valgrind-light
 , enableGalliumNine ? stdenv.isLinux
 , enableOSMesa ? stdenv.isLinux
 , enableOpenCL ? stdenv.isLinux && stdenv.isx86_64