Remove Perl core modules

- While I'm here:
  - Add NO_ARCH
  - Use USES=tar:tgz
  - Convert to options target helper
- Bump PORTREVISION for dependency change

With hat:	perl

mail/spamass-ixhash/Makefile

@@ -3,11 +3,10 @@
 
 PORTNAME=	iXhash
 PORTVERSION=	1.5.5
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	mail
 MASTER_SITES=	SF/ixhash/${PORTNAME}/${PORTNAME}-${PORTVERSION}/
 PKGNAMEPREFIX=	spamass-
-EXTRACT_SUFX=	.tgz
 
 MAINTAINER=	michael@ranner.eu
 COMMENT=	Plugin for SpamAssassin supporting iXhash
@@ -16,11 +15,12 @@ LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 RUN_DEPENDS=	spamc:mail/spamassassin \
-		p5-Digest-MD5>=0:security/p5-Digest-MD5 \
 		p5-Net-DNS>=0.63:dns/p5-Net-DNS
 
 OPTIONS_DEFINE=	DOCS
+NO_ARCH=	yes
 NO_BUILD=	yes
+USES=		tar:tgz
 
 post-patch:
 	@${REINPLACE_CMD} -e "s,/etc/mail,${LOCALBASE}/etc/mail," \
@@ -30,6 +30,8 @@ do-install:
 	${MKDIR} ${STAGEDIR}${PREFIX}/etc/mail/spamassassin
 	${INSTALL_DATA} ${WRKSRC}/iXhash/iXhash.cf ${STAGEDIR}${PREFIX}/etc/mail/spamassassin/iXhash.cf.sample
 	${INSTALL_DATA} ${WRKSRC}/iXhash/iXhash.pm ${STAGEDIR}${PREFIX}/etc/mail/spamassassin
+
+do-install-DOCS-on:
 	${MKDIR} ${STAGEDIR}${DOCSDIR}
 .for i in CHANGELOG LICENSE WHERE_ARE_THE_OTHER_FILES INSTALL README
 	${INSTALL_DATA} ${WRKSRC}/${i} ${STAGEDIR}${DOCSDIR}/