intel: Disable shader cache when executing intel_clc during the build

With the shader cache enabled, intel_clc attempts to write to ~/.cache.
Many distributions' build systems limit file-system access, and will
kill the process thus causing the build to fail.

Fixes: 639665053f ("anv/grl: Build OpenCL kernels")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22968>

src/intel/vulkan/grl/meson.build

@@ -142,6 +142,7 @@ foreach t : [['125', 'gfx125', 'dg2']]
                                    # without modifying grl source code, remove
                                    # if fixed there
       ],
+      env: ['MESA_SHADER_CACHE_DISABLE=true'],
       depends : [prog_intel_clc]
     )
   endforeach