emugl: GLDispatch: do not use static function pointers.

This converts the GLDispatch members from static to instance-based.
There is no point in using static members here, since there is only
once static instance of GLDispatch per GLES 1.x/2.0 library.

Change-Id: Ie3c451efcbf146d600a764a6d4b6b9442f02387f
2 files changed