Clang: macOS: fix unknown integer types

Always exclude clang include paths which do not come
with libclang used by code model.
This solves the issue with GCC that uses system clang
include folder on macOS.

Task-number: QTCREATORBUG-19397
Change-Id: I3b4845248a3cf03a95fbd4038856f8fb31346bfa
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/cpptools/clangcompileroptionsbuilder.h

@@ -44,8 +44,6 @@ public:
     virtual void addPredefinedHeaderPathsOptions();
     virtual void addExtraOptions();
 
-    bool excludeHeaderPath(const QString &path) const override;
-
     virtual void addWrappedQtHeadersIncludePath();
     void addProjectConfigFileInclude();