st/dri: Add support for DRIimage extension mapImage/unmapImage
st/dri: Add support for DRIimage extension mapImage/unmapImage

Implement support for mapImage/unmapImage functions in version 12 of the
DRIimage extension.

Signed-off-by: Rob Herring <fbb37eacae100e13076d5c4b46f06cfa4d6fa9f8@kernel.org>
[Emil Velikov: align/indent the map/unmap vfuncs]
Signed-off-by: Emil Velikov <4c996f2f093ddd0585a556460b4cc3ba555546ef@gmail.com>
Reviewed-by: Eric Anholt <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@anholt.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler