Fix OSX build.
Fix OSX build.

Broken in "Made Mesh use VAOs on OpenGL ES 3 or above."
Change courtesy of Yifeng.

Tested: Builds on OSX now.
Change-Id: I7f376b67dc6c6273ac7a2034b24aabd8bede830b

google/fplbase,google/fplbase,google/fplbase,google/fplbase