glapi: remove the final function offset tags

glapi: remove the final function offset tags

A commit earlier this year reworked out python scripts to use a separate
file for these. Followed by removing support from the parser, and
removing all of the offset tags.

Seems like we either missed a few, or people added them by mistake.
Either way let's nuke the ones that are still around.

Cc: Ian Romanick <ian.d.romanick@intel.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>