glsl: stop allocating memory for UBOs during linking
glsl: stop allocating memory for UBOs during linking

This just stops counting and assigning a storage location for
these uniforms, the count is only used to create the uniform storage.

These uniform types don't use this storage.

Reviewed-by: Samuel Iglesias Gonsálvez <b753b212f30aed827c3eea2e437609dc37310153@igalia.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler