util: Improve comment for workaround

Now that a version of GLib that contains the fix has been
released, it's more useful to record that information. Adding
a TODO annotation makes the whole thing easily greppable.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/util/virfile.c

@@ -1747,8 +1747,7 @@ virFindFileInPath(const char *file)
         return NULL;
 
     /* Workaround for a bug in g_find_program_in_path() not returning absolute
-     * path as documented.  This has been fixed in
-     * https://gitlab.gnome.org/GNOME/glib/-/merge_requests/2127
+     * path as documented. TODO drop it once we require GLib >= 2.69.0
      */
     return g_canonicalize_filename(path, NULL);
 }