Clang: Compile against llvm/clang 4.0

Task-number: QTCREATORBUG-17692
Change-Id: I2781129543c09aa64938c9570896d592b57a753c
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/tools/clangpchmanagerbackend/source/collectincludespreprocessorcallbacks.h

@@ -165,7 +165,11 @@ public:
         if (!realPath.empty())
             return fromNativePath({realPath.data(), realPath.size()});
 
+#if LLVM_VERSION_MAJOR >= 4
+        return fromNativePath({file->getName().data(), file->getName().size()});
+#else
         return fromNativePath(file->getName());
+#endif
     }
 
 private: