comms/opencbm-plugin-xa1541: Fix run depends

The XA1541 plugin must depend on the exact same version of opencbm base.

* Make sure both ports use the same PORTREVISION by defining it in
  comms/opencbm/Makefile.inc and enforcing no explicit definition in the
  port Makefiles.
* Use PKGVERSION instead of PORTVERSION to construct the dependency.

Reported by:	pkg-fallout

comms/opencbm-plugin-xa1541/Makefile

@@ -9,8 +9,8 @@ WWW=		http://opencbm.sourceforge.net/
 LICENSE=	GPLv2
 
 BUILD_DEPENDS=	cc65:devel/cc65
-RUN_DEPENDS=	opencbm=${PORTVERSION}:comms/opencbm \
-		opencbm-kmod=${PORTVERSION}:comms/opencbm-kmod
+RUN_DEPENDS=	opencbm=${PKGVERSION}:comms/opencbm \
+		opencbm-kmod>0:comms/opencbm-kmod
 
 USES=		gmake pkgconfig
 USE_LDCONFIG=	yes

comms/opencbm/Makefile

@@ -1,6 +1,5 @@
 PORTNAME=	opencbm
 PORTVERSION=	${OCBM_VERSION}
-PORTREVISION=	1
 CATEGORIES=	comms archivers
 
 MAINTAINER=	zirias@FreeBSD.org

comms/opencbm/Makefile.inc

@@ -1,4 +1,5 @@
 OCBM_VERSION=	0.4.99.104
+OCBM_REVISION=	1
 DISTVERSIONPREFIX=	v
 DISTINFO_FILE=	${.CURDIR}/../opencbm/distinfo
 
@@ -17,3 +18,11 @@ PLIST_SUB=	OCBM_VERSION=${OCBM_VERSION}
 PORTSCOUT=	limit:^v\d
 
 PLUGINBASENAME=	${PREFIX}/lib/opencbm/plugin/libopencbm-
+
+.if ${PORTNAME:Nopencbm-kmod}
+.  if defined(PORTREVISION)
+IGNORE=		PORTREVISION must not be defined explicitly
+.  else
+PORTREVISION=	${OCBM_REVISION}
+.  endif
+.endif