gioerror: Handle EMLINK error as too-many-links error

This used to be a FreeBSD only error but it's actually defined also in
linux.

gio/gioerror.c

@@ -121,6 +121,12 @@ g_io_error_from_errno (gint err_no)
       break;
 #endif
 
+#ifdef EMLINK
+    case EMLINK:
+      return G_IO_ERROR_TOO_MANY_LINKS;
+      break;
+#endif
+
 #ifdef ELOOP
     case ELOOP:
       return G_IO_ERROR_TOO_MANY_LINKS;