Re: ports/print/ghostscript: add ghost{pcl6,xps,pdl,pdf}

This is a confusing way to handle the naming:

> DISTNAME = ghostscript-${VERSION}
> +DISTFILES = ghostpdl-${VERSION}${EXTRACT_SUFX}
...
> +WRKDIST = ${WRKDIR}/ghostpdl-${VERSION}

- it would be simpler like this:

DISTNAME = ghostpdl-${VERSION}
PKGNAME = ghostscript-${VERSION}