Another win32 compile fix.

Related commit is 5bcb5337.
CCMAIL: okellogg@users.sourceforge.net

umbrello/layoutgenerator.cpp

@@ -106,16 +106,16 @@ QString LayoutGenerator::currentDotPath()
     }
 #ifdef Q_OS_WIN
     // search for dot installation
-    QString appDir(qgetenv("ProgramFiles"));
+    QString appDir(QLatin1String(qgetenv("ProgramFiles").constData()));
     QDir dir(appDir);
     dir.setFilter(QDir::Dirs);
-    dir.setNameFilters(QStringList() << "Graphviz*");
+    dir.setNameFilters(QStringList() << QLatin1String("Graphviz*"));
     dir.setSorting(QDir::Reversed);
     QFileInfoList list = dir.entryInfoList();
     if (list.size() > 0) {
         QString dotPath = list.at(0).absoluteFilePath();
-        QString exePath = QFile::exists(dotPath + "\\bin") ? dotPath + "\\bin" : dotPath;
-        return QFile::exists(exePath + "\\dot.exe") ? exePath : QString();
+        QString exePath = QFile::exists(dotPath + QLatin1String("\\bin")) ? dotPath + QLatin1String("\\bin") : dotPath;
+        return QFile::exists(exePath + QLatin1String("\\dot.exe")) ? exePath : QString();
     }
 #endif
     return QString();