[pygame] Do we want blitting where the source surface is opengl?

[Lenard Lindstrom <len-l@xxxxxxxxx>]

While fixing the save bug for opengl surfaces on Windows I found that a 
blit segfaults when the source surface is opengl. Do we want to do this? 
At the very least Pygame.blit needs to raise an exception if the source 
surface is opengl. This means additional overhead per blit anyway.

--
Lenard Lindstrom
<len-l@xxxxxxxxx>