Bug#582801: SDL_GL_SWAP_CONTROL fix for X11 [patch]

[Sylvain Beucler]

Hi,

When experimenting with vsync under GNU/Linux, I noticed that
SDL_GL_SWAP_CONTROL was an "OpenGL attribute [] unsupported on this
system".

(I was using Pygame and first thought it was a pygame- or X11-specific
issue, but then I found out that I could use vsync with Pyglet so it
definitely should have worked).

The bug is due to (AFAICT) an implementation oversight in
video/x11/SDL_x11gl.c: it tries to load 'glXSwapIntervalMESA' or
'glXSwapIntervalSGI' dynamically from '/usr/lib/libGL.so.1', while it
should load them through 'glXGetProcAddressARB'.

The following tiny patch does just that, and I now get my smooth
scrolling :)

What do you think?

-- 
Sylvain
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