multimedia/mkvalidator: Fix build with llvm16

Approved by:	portmgr (blanket)
Sponsored by:	The FreeBSD Foundation

multimedia/mkvalidator/Makefile

@@ -29,6 +29,12 @@ PLIST_FILES=	bin/mkvalidator bin/mkvtree
 
 MAKE_JOBS_UNSAFE=	yes
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400091 || ( ${OSVERSION} >= 1302507 && ${OSVERSION} < 1400000 ))
+CFLAGS+=	-Wno-error=incompatible-function-pointer-types
+.endif
+
 post-patch:
 	@${REINPLACE_CMD} -e \
 		'/STRIP/s|strip|${STRIP_CMD:T}| ; \