games/tecnoballz: fix build on FreeBSD 15.1

CHAR_WIDTH is now a macro defined by <limits.h> (from C23).

While we are at it, roll static REINPLACE_CMD usage into existing patch
file.

MFH: 2026Q2
Approved by: portmgr (build fix blanket)

(cherry picked from commit c758ccc79c2bb3db009274cb68b102c830640f5d)