[Interest] Choosing clang in CMake project still uses /usr/bin/cc

[Nikos Chantziaras]

When choosing the clang kit in a cmake project, Creator sets 
CMAKE_CXX_COMPILER to clang++, but CMAKE_C_COMPILER is set to 
/usr/bin/cc, which is GCC. So I get a project that's built partly with 
clang, partly with gcc.

Is this a bug?