shells/klish: Fix build with llvm16

- Pet portclippy

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

shells/klish/Makefile

@@ -11,8 +11,16 @@ LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENCE
 
 USES=		libtool tar:xz
-GNU_CONFIGURE=	yes
 USE_LDCONFIG=	yes
+
+GNU_CONFIGURE=	yes
+
 INSTALL_TARGET=	install-strip
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400091 || ( ${OSVERSION} >= 1302507 && ${OSVERSION} < 1400000 ))
+CFLAGS+=	-Wno-error=incompatible-function-pointer-types
+.endif
+
 .include <bsd.port.mk>