Add stubs for wglSwapIntervalEXT & wglGetSwapIntervalEXT

[Troy Rollo]

At least one game (Star Wars: Knights of the Old Republic) attempts to call 
wglSwapIntervalEXT without testing the pointer returned by wglGetProcAddress, 
resulting in a SEGV. This patch adds a stub for wglSwapIntervalEXT and the 
related wglGetSwapIntervalEXT, which is sufficient for SWKotOR to get at 
least as far as its main menu. It does not advertise the availability of this 
extension since if an app tests for it that way, it's better that it not be 
found.

ChangeLog:
 Add stubs for wglSwapIntervalEXT & wglGetSwapIntervalEXT
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