math/octave-forge-video: Move to FFmpeg 4

Fails to build with FFmpeg 6

PR:		270281
Approved by:	portmgr (blanket, build fix)
Sponsored by:	Blinkinblox

math/octave-forge-video/Makefile

@@ -12,11 +12,12 @@ WWW=		https://packages.octave.org/
 LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKDIR}/${OCTAVE_SRC}/COPYING
 
-LIB_DEPENDS=	libavcodec.so:multimedia/ffmpeg
+LIB_DEPENDS=	libavcodec.so.58:multimedia/ffmpeg4
 
 USES=		octave pkgconfig
-
 GNU_CONFIGURE=	yes
-CONFIGURE_ENV+=	HOME=${WRKSRC}
+
+CPPFLAGS+=	-I${LOCALBASE}/ffmpeg4/include
+CONFIGURE_ENV+=	HOME=${WRKSRC} PKG_CONFIG_PATH="${LOCALBASE}/ffmpeg4/libdata/pkgconfig"
 
 .include <bsd.port.mk>