clover: Implement clCreateImage?D w/ clCreateImage.
clover: Implement clCreateImage?D w/ clCreateImage.

Remplace clCreateImage2D and clCreateImage3D implementation with call
to clCreateImage.

Reviewed-by: Francisco Jerez <5906ff32bdd9fd8db196f6ba5ad3afd6f9257ea5@riseup.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler