Fix windows proxy setting again.

Broke with 4edec9f9.

Change-Id: I1dfad5964f7d36566de0874d19e7ca94e3b92054
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/app/main.cpp

@@ -284,11 +284,13 @@ int main(int argc, char **argv)
                             proxyUrl.port(), proxyUrl.userName(), proxyUrl.password());
         QNetworkProxy::setApplicationProxy(proxy);
     }
-#if defined(Q_OS_MAC)
+# if defined(Q_OS_MAC) // unix and mac
     else {
         QNetworkProxyFactory::setUseSystemConfiguration(true);
     }
-#endif
+# endif
+#else // windows
+    QNetworkProxyFactory::setUseSystemConfiguration(true);
 #endif
     // Load
     const QStringList pluginPaths = getPluginPaths();