Fix crash signature 608

This was a crash in LLPanelDirClassified::postBuild(), on the line changed here, probably accessng null pointer.
There are probably a few other signatures for this in our database.
llcommon.dll doer faster. (set /LTCG and /GL)
Merge branch 'master' of git@github.com:Shyotl/SingularityViewer.git