I used glcorearb.h as input file
Code is limited to core gl + KHR/ARB extension
GL1.X must be handled manually (need only 3 functions)
I think the solution would be to migrate gl.h/glext.h to the
single glcorearb.h. However we might need to update the code to fetch
pointer accordingly
Note: we don't check the null ptr anymore on GSwnd. It isn't important
as we check the extension.
v2: update copyright
v3: update copyright space
v4: update copyright of script
fix copyright