CMake is using "c++" as the compiler and the clang detection fails.
Since we require C++11 at this point, enable it in all cases.
Removed the MSVC todos since we don't plan supporting it yet.
In order to avoid the warning
warning: anonymous variadic macros were introduced in C99
Due to the use of variadic macro in the qDebug macro in Qt 5.3
C++11 requires a space between string literal and macro to avoid the
ambiguity with user defined litteral
