cogl: Add support for GL_ANGLE_pack_reverse_row_order

This is the GLES equivalent of GL_MESA_pack_invert.

GNOME/mutter!980
5 jobs for !980 with gl-angle-pack-reverse-row-order in 11 minutes and 3 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Review
passed #533580
check-commit-log

00:00:20

 
  Build
passed #533581
build-mutter

00:06:43

passed #533582
build-without-native-backend-and-wayland

00:04:56

 
  Test
passed #533584
can-build-gnome-shell

00:02:18

passed #533583
test-mutter

00:03:59