Add archivers/xz as a build dependency on systems which do not have it
in the base system.  This fixes the package build.

Submitted by:   pointyhat via pav

Sanity Test Results

astro/boinc-astropulse:

This command (FreshPorts code 1):

make -V PORTNAME -V PKGNAME -V DESCR -V CATEGORIES -V PORTVERSION -V
PORTREVISION  -V COMMENT -V COMMENTFILE -V MAINTAINER -V EXTRACT_SUFX  -V
BUILD_DEPENDS -V RUN_DEPENDS -V LIB_DEPENDS -V FORBIDDEN -V BROKEN -V
DEPRECATED -V IGNORE  -V MASTER_PORT -V LATEST_LINK -V NO_LATEST_LINK -V
NO_PACKAGE -V PKGNAMEPREFIX -V PKGNAMESUFFIX -V PORTEPOCH  -V RESTRICTED -V
NO_CDROM -V EXPIRATION_DATE -V IS_INTERACTIVE  -V ONLY_FOR_ARCHS -V
NOT_FOR_ARCHS -V LICENSE -f
/usr/home/dan/ports/astro/boinc-astropulse/Makefile 
DISTDIR=/usr/ports/distfiles  PORTSDIR=/usr/home/dan/ports
LOCALBASE=/nonexistentlocal
2>/tmp/FreshPorts.astro.boinc-astropulse.make-error.2011.3.17.23.28.29.3082
7

produced this error:

Error message is: "/usr/home/dan/ports/astro/boinc-astropulse/Makefile",
line 23: Malformed conditional ((${OSVERSION} >= 900000 && ${OSVERSION} <
900012) || ${OSVERSION} < 800505)
"/usr/home/dan/ports/astro/boinc-astropulse/Makefile", line 25: if-less
endif
make: fatal errors encountered -- cannot continue

5 vulnerabilities affecting 20 ports have been reported in the past 14 days

^* - modified, not new

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