Add MODTK_BIN to SUBST_VARS; no longer added by the Tk port module.



diff -Nurp /usr/ports//misc/WordGenerator/Makefile ./Makefile
--- /usr/ports//misc/WordGenerator/Makefile	Wed Jan 21 22:31:39 2026
+++ ./Makefile	Sat Feb  7 10:15:57 2026
@@ -22,8 +22,8 @@ RUN_DEPENDS =		devel/tcllib>=1.8 \
 
 NO_BUILD =		Yes
 NO_TEST =		Yes
-
 PKG_ARCH =		*
+SUBST_VARS =		MODTK_BIN
 
 pre-configure:
 	${SUBST_CMD} ${WRKSRC}/WordGenerator.tcl