mesa: Add core support for EXT_multisampled_render_to_texture{,2}

This also turns on EXT_multisampled_render_to_texture which is a
subset of EXT_multisampled_render_to_texture2, allowing only
COLOR_ATTACHMENT0.

Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Kristian H. Kristensen <hoegsberg@chromium.org>
10 files changed