Removed 'register' storage class compiler warnings

Change-Id: Iba89a9d0845bf7e816983f903281d33e273f6e35
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5558
Reviewed-by: X512 <danger_mail@list.ru>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

Break glut out from mesa lib

As glut is no longer in upstream Mesa and no longer developed
we will need to keep a fork.

Break glut out from mesa lib

As glut is no longer in upstream Mesa and no longer developed
we will need to keep a fork.