gr_opengl_string retooled to use glDrawArrays. Should be a bit faster now.

git-svn-id: svn://svn.icculus.org/fs2open@11165 387891d4-d844-0410-90c0-e4c51a9137d3
Fix release script Windows mirror and MD5 links.

git-svn-id: svn://svn.icculus.org/fs2open@11166 387891d4-d844-0410-90c0-e4c51a9137d3
Minor followup to r11150.

The regular parsing code not using the same broken logic as parse_comments() is not the same thing as it "ignoring" too high versions, and searching for repetitions of the same token would result in just finding the first one over and over again (the likelihood of this actually mattering to anyone is minuscule, but I needed something to test commit access, and this code has been tested).

git-svn-id: svn://svn.icculus.org/fs2open@11167 387891d4-d844-0410-90c0-e4c51a9137d3