added dependancy on unzip

git-svn-id: https://svn.macports.org/repository/macports/trunk/dports@2079 d073be05-634f-4543-b044-5fe20cf6d1d6

textproc/docbook-xml/Portfile

@@ -5,7 +5,8 @@ version		4.2
 description	the docbook xml dtds
 categories	textproc
 platforms	darwin
-maintainers	mike-docbookxml@gene-hacker.net
+maintainers	michaelm@opendarwin.org
+depends_build     bin:unzip:unzip
 
 master_sites	http://www.oasis-open.org/docbook/xml/4.2/
 checksums	md5 73fe50dfe74ca631c1602f558ed8961f