multimedia/gst123: Fix build on 13

Can't find ncurses during configure stage:
checking for ncurses >= 5... no
checking for ncurses6-config... false
checking for ncurses5-config... (cached) false
checking for ncurses-config... (cached) false
configure: error: Neither pkgconfig(ncurses) nor ncurses-config was found.
===>  Script "configure" failed unexpectedly.

PR:	284122
Fixes:	716c8f511a (Update 0.3.3 → 0.4.1 and remove DEPRECATED)

multimedia/gst123/Makefile

@@ -19,8 +19,15 @@ GNU_CONFIGURE=	yes
 
 PLIST_FILES=	bin/${PORTNAME} share/man/man1/${PORTNAME}.1.gz
 
+.include <bsd.port.pre.mk>
+
+.if ${OPSYS}_${OSREL:R} == FreeBSD_13
+CONFIGURE_ENV=	NCURSES_CFLAGS=-I${NCURSESINC} NCURSES_LIBS=-L${NCURSESLIB}
+LDFLAGS+=	${TINFO_LIB}
+.endif
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/src/${PORTNAME} ${STAGEDIR}${PREFIX}/bin
 	${INSTALL_MAN} ${WRKSRC}/docs/${PORTNAME}.1 ${STAGEDIR}${PREFIX}/share/man/man1
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>