main: Added entry point for glGetTransformFeedbacki64_v

v2: Review from Laura Ekstrand
- use the transform feedback object lookup wrapper

v3:
- use the new name of _mesa_lookup_transform_feedback_object_err

v4: Review from Laura Ekstrand
- fix some alignement problems

Reviewed-by: Laura Ekstrand <laura@jlekstrand.net>
Signed-off-by: Martin Peres <martin.peres@linux.intel.com>
4 files changed