* src/ttdebug.c (RunIns): Signature fix.

A somewhat similar change to what happened in the FreeType library:

  commit 95d635eab1b08a0051de07b6c33067d2c1984848
  Author: Werner Lemberg <wl@gnu.org>
  Date:   Sun May 7 08:34:32 2023 +0200

      [truetype] Signature fixes.

Signed-off-by: Hin-Tak Leung <htl10@users.sourceforge.net>