HAVE_GLEXT_PROTOTYPES not defined correctly...

[Matthew Cline]

The Wine configure script seems to work fine, except that it doesn't define 
HAVE_GLEXT_PROTOTYPES when it should; this causes 
dlls/ddraw/d3ddevice/mesa.c to not compile due to a 
redefinition/redeclaration error, so I have to edit include/config.h by 
hand.  Is there some way of getting configure to properly detect the GL 
extension prototypes?

Thanks in advance.