Allow 2880x1620 in the 16:9 pick list.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2701 86ba831e-150c-0410-ab35-e06eaae15ed9
osx:
* Fixed the compatibility makefile not to delete the generated executable
* fixed a potentially critical compatibility build script error, where the makefile would use an unlimited number of processes instead of a fixed few
* changed <SDL/SDL.h> to "SDL.h" (possibly just temporarily) in SDLMain.m

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2702 86ba831e-150c-0410-ab35-e06eaae15ed9