glamor: GLES fixes, part 1.
It is a first reviewed part of !924 (closed)
It fixes only colors on GL ES. 8bit fonts and PointSize issues will be in separate PR.
Includes !921 (closed) !922 (closed) !923 (closed) !907 (closed)
Superseeds: !401 (closed) !907 (closed)
Fixes #1208 (closed)
Fixes #1354 (closed)
Signed-off-by: Konstantin Pugin <ria.freelander@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Emma Anholt <emma@anholt.net>