mesa: Refuse to bind image uniforms using glUniform in GLES.
mesa: Refuse to bind image uniforms using glUniform in GLES.

The GLES 3.1 spec removed support for updating the image unit bound to
an image uniform using glUniform1i() calls.

Reviewed-by: Tapani Pälli <cdcb67a5e49297de94340ca09f25994bd5e7f762@intel.com>
Reviewed-by: Ian Romanick <2b237cafb16dc45038e85df6c85e74e6d899eba9@intel.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler