anv/wsi/x11: start refactoring out the image allocation/free functionality
anv/wsi/x11: start refactoring out the image allocation/free functionality

Reviewed-by: Jason Ekstrand <68c46a606457643eab92053c1c05574abb26f861@jlekstrand.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler