Support usb connected gps's under windows. Addresses ticket #201.

git-svn-id: http://svn.osgeo.org/qgis/trunk@5841 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: g_j_m

src/plugins/gps_importer/qgsgpsplugingui.cpp

@@ -315,8 +315,10 @@ void QgsGPSPluginGui::populatePortComboBoxes() {
 #ifdef WIN32
   cmbULPort->insertItem("com1");
   cmbULPort->insertItem("com2");
+  cmbULPort->insertItem("usb:");
   cmbDLPort->insertItem("com1");
   cmbDLPort->insertItem("com2");
+  cmbDLPort->insertItem("usb:");
 #endif
 
   // OSX, OpenBSD, NetBSD etc? Anyone?