Add check to prevent building in source directory.
Add check to prevent building in source directory.

jessdtate/SCIRun,collint8/SCIRun,moritzdannhauer/SCIRunGUIPrototype,jessdtate/SCIRun,moritzdannhauer/SCIRunGUIPrototype,collint8/SCIRun,ajanson/SCIRun,ajanson/SCIRun,ajanson/SCIRun,jessdtate/SCIRun,moritzdannhauer/SCIRunGUIPrototype,ajanson/SCIRun,moritzdannhauer/SCIRunGUIPrototype,jcollfont/SCIRun,jessdtate/SCIRun,moritzdannhauer/SCIRunGUIPrototype,collint8/SCIRun,ajanson/SCIRun,jcollfont/SCIRun,moritzdannhauer/SCIRunGUIPrototype,collint8/SCIRun,jcollfont/SCIRun,jessdtate/SCIRun,collint8/SCIRun,ajanson/SCIRun,ajanson/SCIRun,jessdtate/SCIRun,collint8/SCIRun,jessdtate/SCIRun,collint8/SCIRun,jcollfont/SCIRun,collint8/SCIRun,moritzdannhauer/SCIRunGUIPrototype,jcollfont/SCIRun,jessdtate/SCIRun,jcollfont/SCIRun,jcollfont/SCIRun