Ignore the include path for intrinsics coming from the toolchain. The
clang static analyzer comes with its own intrinsics and does not cope
well with intrinsics from other clang versions.
Move the relevant implementation from LibClangOptionsBuilder into the
base class so that ClangStaticAnalyzer profits from this, too.
Task-number: QTCREATORBUG-17102
Change-Id: Id9a28ddebb889c862939332dce888a80b3bb7e63
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>