remove superfluous property declaration

compilerPath is already declared in CppModule.qbs.

Change-Id: Id4177f3ec4874d5315c441153f4b9db48bae1da8
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
MSVC: respect cpp.compilerPath and cpp.compilerName

Change-Id: Ia87a6c502e8ebd1a3493e8c4409b7e9d081d204a
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>