make release fails if ghostscript8-8.70 is installed

[David Boyd]

When attempting make release (7.3-PRERELEASE or 7.2-RELEASE or
8.0-RELEASE-p2) and ghostscript8-8.70 is installed on the build machine the
following error occurs:

===>  ghostscript8-nox11-8.70 conflicts with installed package(s):
	ghostscript8-8.70

	They install files into the same place.

	Please remote them first with pkg_delete(1).

*** Error code 1

Stop in /u/release/usr/ports/print/ghostscript8-nox11.

*** Error code 1

Stop in /u/release/usr/ports/textproc/docproj.

*** Error code 1

Stop in /var/cvsup/usr/src/release.

*** Error code 1

Stop in /var/cvsup/usr/src/release.

I can work around this by defining NODOC in /etc/make.conf or by deleting
the ghostscipt8 package before running make release.

I never had this problem in previous builds (6.4-RELEASE and 7.1-RELEASE).

Is this expected/normal?

Thanks.