mesa: Silence unused parameter warning

mesa: Silence unused parameter warning

Unused since e4da8b9c331 ("mesa/compiler: rework tear down of
builtin/types").

src/mesa/main/context.c: In function ‘_mesa_free_context_data’:
src/mesa/main/context.c:1321:54: warning: unused parameter ‘destroy_compiler_types’ [-Wunused-parameter]
 1321 | _mesa_free_context_data(struct gl_context *ctx, bool destroy_compiler_types)
      |                                                      ^

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>