[fpc-devel] OpenGL patch

[Ales Katona]

Ok so here's the patch. If you feel some things should change, tell me 
about it.
This patch adds "TryLoadGL[u[t]]" and "GL[u[t]]IsLoaded" methods and 
also "fixes" the crash on win32 if opengl is not present. (but it will 
still crash later, if the user doesn't check)

Ales
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