Fixes: Crash on windows on loading projects.pro

RevBy:    Patch by eskil
Details:  I can't really see why the path could be wrong there, and
can't reproduce the crash.

src/plugins/qt4projectmanager/qt4nodes.cpp

@@ -84,7 +84,7 @@ Qt4PriFileNode::Qt4PriFileNode(Qt4Project *project,
         : ProjectNode(filePath),
           m_core(project->qt4ProjectManager()->core()),
           m_project(project),
-          m_projectFilePath(filePath),
+          m_projectFilePath(QDir::fromNativeSeparators(filePath)),
           m_projectDir(QFileInfo(filePath).absolutePath()),
           m_includeFile(0),
           m_saveTimer(new QTimer(this)),