fuse: fix build when not available

The 'localmountpoint' variable in the handle is available only when
building with FUSE support, so guard it in a proper #ifdef block.

Fixes commit 296370fb86.

Thanks to: Corentin Labbe (both reporting, and testing)

lib/handle.c

@@ -399,7 +399,9 @@ guestfs_close (guestfs_h *g)
   free (g->hv);
   free (g->backend);
   free (g->backend_data);
+#if HAVE_FUSE
   free (g->localmountpoint);
+#endif
   guestfs_int_free_string_list (g->backend_settings);
   free (g->append);
   guestfs_int_free_error_data_list (g);