Don't needlessly call updateProjectInfo()

Should not be necessary when nothing changed in the project info. This
also fixes a problem where include file scanning happened twice after
saving a pro file.

Reviewed-by: Roberto Raggi

src/plugins/cpptools/cppmodelmanager.cpp

@@ -331,9 +331,8 @@ void CppPreprocessor::resetEnvironment()
 
 bool CppPreprocessor::includeFile(const QString &absoluteFilePath, QString *result)
 {
-    if (absoluteFilePath.isEmpty() || m_included.contains(absoluteFilePath)) {
+    if (absoluteFilePath.isEmpty() || m_included.contains(absoluteFilePath))
         return true;
-    }
 
     if (m_workingCopy.contains(absoluteFilePath)) {
         m_included.insert(absoluteFilePath);