math/add: Move manpages to share/man

While here, move pkg-plist to PLIST_FILES

math/add/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	add
 PORTVERSION=	20230205
+PORTREVISION=	1
 CATEGORIES=	math
 MASTER_SITES=	ftp://dickey.his.com/add/
 
@@ -15,9 +16,13 @@ GNU_CONFIGURE=	yes
 
 MAKEFILE=	makefile
 
+PLIST_FILES=	bin/add \
+		share/man/man1/add.1.gz
+PORTDATA=	add.hlp
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/add ${STAGEDIR}${PREFIX}/bin
-	${INSTALL_MAN} ${WRKSRC}/add.1 ${STAGEDIR}${MANPREFIX}/man/man1
+	${INSTALL_MAN} ${WRKSRC}/add.1 ${STAGEDIR}${PREFIX}/share/man/man1
 	@${MKDIR} ${STAGEDIR}${DATADIR}
 	${INSTALL_DATA} ${WRKSRC}/add.hlp ${STAGEDIR}${DATADIR}
 

math/add/pkg-plist

@@ -1,3 +0,0 @@
-bin/add
-man/man1/add.1.gz
-%%DATADIR%%/add.hlp