Backport of "gl: Fix prototype of glGetSynciv()" into 1.18
requested to merge tpm/gst-plugins-base:backport-mr-914-into-1.18-glGetSynciv-prototype-fix into 1.18
Backport of !914 (merged) "gl: Fix prototype of glGetSynciv()".
Commits:
- 576f950e gl: Fix prototype of glGetSynciv()