So i prefer to do fixes to not have more any problems with "not corrects headers" than waiting for corrects one (or if you prefer you can put correct headers on wine source tree).
Well, you are free to fix those warnings if you wish (I won't do it as it works perfectly well on my system so I cannot test with what I consider broken headers).
If you do so, change also the 'make_opengl' Perl script as I would prefer not to always come behind people comitting direct fixes to the auto-generated files as soon as I want to update the files.
Lionel