Log Message:
6.4.2  February 2, 2006
    New:
	- added OSMesaColorClamp() function/feature
	- added wglGetExtensionStringARB() function
    Bug fixes:
	- fixed some problems when building on Windows
	- GLw header files weren't installed by installmesa script (bug 5396)
	- GL/glfbdev.h file was missing from tarballs
	- fixed TNL initialization bug which could lead to crash (bug 5791)