Ensure that the default keymap is US english if there is a problem locating one.

Index: xrdp/xrdp/lang.c
===================================================================
--- xrdp.orig/xrdp/lang.c	2012-09-29 13:01:00.267338590 +0200
+++ xrdp/xrdp/lang.c	2012-09-29 13:03:28.446647925 +0200
@@ -239,6 +239,13 @@
       g_file_close(fd);
     }
   }
+  else if (keylayout != 0x409)
+  {
+    g_free(filename);
+    g_writeln("keymap for 0x%4.4x was not found. Falling back to 0x0409 instead",
+	      keylayout);
+    return get_keymaps(0x409, keymap);
+  }
   g_free(filename);
   return 0;
 }