red-alert will now work with ships that appear at some point subsequent to mission start

git-svn-id: svn://svn.icculus.org/fs2open@10267 387891d4-d844-0410-90c0-e4c51a9137d3
Add cmdline flag to disable use of pixel buffer objects

Workaround a bug/deficiency in recent linux intel video drivers

git-svn-id: svn://svn.icculus.org/fs2open@10268 387891d4-d844-0410-90c0-e4c51a9137d3