QT_USE_FAST_OPERATOR_PLUS still breaks *some* macs ...

... so just disable it for all macs.

qtcreator.pri

@@ -90,7 +90,7 @@ LIBS += -L$$IDE_LIBRARY_PATH
 
 #DEFINES += QT_NO_CAST_FROM_ASCII
 DEFINES += QT_NO_CAST_TO_ASCII
-DEFINES += QT_USE_FAST_OPERATOR_PLUS QT_USE_FAST_CONCATENATION
+!macx:DEFINES += QT_USE_FAST_OPERATOR_PLUS QT_USE_FAST_CONCATENATION
 
 unix {
     CONFIG(debug, debug|release):OBJECTS_DIR = $${OUT_PWD}/.obj/debug-shared