egl: Rename MESA_configless_context bit to KHR_no_config_context

Keep the old name in the extension string, but refer to the KHR
extension internally.

Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Adam Jackson <ajax@redhat.com>
4 files changed