Work around kde file dialog being broken

Task-number: QTCREATORBUG-7771
Change-Id: I11a41f624dbeddbbff75e2b3a827315d26995425
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@nokia.com>

src/plugins/qtsupport/qtoptionspage.cpp

@@ -622,6 +622,11 @@ static QString filterForQmakeFileDialog()
         filter += QLatin1Char('*');
 #endif
         filter += commands.at(i);
+#if defined(Q_OS_UNIX) && !defined(Q_OS_MAC)
+        // kde bug, we need at least one wildcard character
+        // see QTCREATORBUG-7771
+        filter += QLatin1Char('*');
+#endif
     }
     filter += QLatin1Char(')');
     return filter;