Use C++11 parsing mode for CMake, AutoTools and Generic project managers

Those 3 project managers can't easily figure out the right mode for code
parsing. The code we are parsing is predominantly C++98 code. But for
those using C++98 toolchains having valid C++11 code not be marked as a
error is probably not much of a problem, whereas the reverse, using a
C++11 toolchain and having valid code being marked as a error is
annoying.

Change-Id: I8dcc172029045cf591b3ba0adef1585f3f94fd39
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/cpptools/ModelManagerInterface.h

@@ -73,7 +73,7 @@ public:
     {
     public:
         ProjectPart()
-            : language(CXX)
+            : language(CXX11)
             , qtVersion(UnknownQt)
         {}