Enable C++11 on all platforms except Mac/release

This allows us to profit from the Qt extensions for C++11, and also
makes sure e.g. QTC_OVERRIDE is consistenly checked. We can't enable
it (yet) for Mac/release though to be able to deploy to 10.6 ..

Change-Id: Icd26ab5f971532ff10a892221c653987026ac88d
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

qtcreator.pri

@@ -5,6 +5,9 @@ QTCREATOR_VERSION = 3.0.81
 QTCREATOR_COMPAT_VERSION = 3.0.81
 BINARY_ARTIFACTS_BRANCH = master
 
+# enable c++11 on everything but mac/release (breaks 10.6)
+!macx|CONFIG(debug, debug|release): CONFIG += c++11
+
 isEqual(QT_MAJOR_VERSION, 5) {
 
 defineReplace(cleanPath) {