Harmattan: Don't overwrite manifest file when opening project.

Task-number: QTCREATORBUG-6117

Change-Id: I53bf05340ee20596f4a2a5cfee81735f037b22cb
Reviewed-on: http://codereview.qt-project.org/5011

Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

src/plugins/remotelinux/qt4maemotarget.cpp

@@ -1142,7 +1142,9 @@ QString Qt4HarmattanTarget::aegisManifestFileName()
 void Qt4HarmattanTarget::handleTargetAddedSpecial()
 {
     AbstractDebBasedQt4MaemoTarget::handleTargetAddedSpecial();
-    QFile(debianDirPath() + QLatin1Char('/') + aegisManifestFileName()).open(QIODevice::WriteOnly);
+    QFile aegisFile(debianDirPath() + QLatin1Char('/') + aegisManifestFileName());
+    if (!aegisFile.exists())
+        aegisFile.open(QIODevice::WriteOnly);
 }
 
 void Qt4HarmattanTarget::addAdditionalControlFileFields(QByteArray &controlContents)