ClangTools: Show also diagnostics from project's header files

Fixes: QTCREATORBUG-21452
Change-Id: I73c85224e142f4f1d08c9ada75fe8359ebf0f984
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/plugins/clangtools/clangtoolslogfilereader.h

@@ -35,6 +35,7 @@ namespace ClangTools {
 namespace Internal {
 
 QList<Diagnostic> readSerializedDiagnostics(const QString &filePath,
+                                            const Utils::FileName &projectRootDir,
                                             const QString &logFilePath,
                                             QString *errorMessage);