Fix tests build with GCC 5

Change-Id: Ia2e0a1c69f73446b45915559294e3348e725ce56
Reviewed-by: hjk <hjk@theqtcompany.com>

tests/auto/debugger/offsets.pro

@@ -3,6 +3,8 @@ include(../qttest.pri)
 
 QT += core-private
 
+CONFIG -= c++11 # Fails to build with boost (due to #define private public)
+
 exists(/usr/include/boost/unordered/unordered_set.hpp) {
     DEFINES += HAS_BOOST
 }