Add scempegbase stuff

Find in homebrew game
Merge pull request #5735 from sum2012/scempegbase

Add scempegbase stuff
Win32: when an invalid OpenGL driver is detected, don't offer a choice of quitting or not, just quit.
Include the renderer string too, for possibly extra helpful info.
Merge pull request #5716 from thedax/win32ErrorMsg

Win32: when an invalid OpenGL driver is detected, don't offer a choice of quitting or not, just quit.
Merge remote-tracking branch 'origin/master' into master_0.9.8