mesa: Silence unused parameter warning
mesa: Silence unused parameter warning

main/pipelineobj.c: In function ‘delete_pipelineobj_cb’:
main/pipelineobj.c:110:30: warning: unused parameter ‘id’ [-Wunused-parameter]
 delete_pipelineobj_cb(GLuint id, void *data, void *userData)
                              ^

Signed-off-by: Ian Romanick <2b237cafb16dc45038e85df6c85e74e6d899eba9@intel.com>
Reviewed-by: Timothy Arceri <5dd83789ef3714029244367ba1ca09f1d7627408@collabora.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler