configure: remove leftover reference to gnome-vfs

A leftover from commit b40b6010 (ditch
gnome-vfs2 support, 2015-09-02).

Change-Id: I23f34da748a582161bb4a87d2d993a5b4b08aa1e

configure.ac

@@ -4776,7 +4776,6 @@ if test "$USING_X11" != TRUE; then
     test_tde=no
     test_kde4=no
     enable_cairo_canvas=no
-    enable_gnome_vfs=no
 fi
 
 dnl ===================================================================