Acquire an OGL3.2 core profile when available

git-svn-id: https://svn.code.sf.net/p/desmume/code/trunk@5038 5577840e-afb3-4e59-9ef3-2b7f898b1952
Remove the useless include

git-svn-id: https://svn.code.sf.net/p/desmume/code/trunk@5039 5577840e-afb3-4e59-9ef3-2b7f898b1952