Use same code for iOS and OS X here, too, not that it seems to help any

Change-Id: I16d11447757680edb0ff786a5ee1e3d453b38910
We build the vclopengl library only for FREEBSD LINUX MACOSX WNT

Change-Id: I6d9f6a33f7f825196d8d2aeec658b9323577ac7c