Make a couple minor corrections to gl_API.xml. Fixes the name of an

Make a couple minor corrections to gl_API.xml.  Fixes the name of an
extension that was missing the GL_ part and uses the core GL type names for
vertex buffer object functions instead of the ARB names.

Also commits the resulting changes to the generated code.  Some how, the
#if sequence disappeared in the 1.52 version of glapi_x86.S.