gl_screen.c (SCR_ScreenShot_f): make sure we don't Sys_Error()
due to buffer allocation failures.


git-svn-id: svn://svn.code.sf.net/p/uhexen2/code/trunk@5359 eaf649e6-6c13-0410-b194-84221022858e
bumped the version date stamp to 2014-11-22.


git-svn-id: svn://svn.code.sf.net/p/uhexen2/code/trunk@5360 eaf649e6-6c13-0410-b194-84221022858e