[bind10-dev] dependency on Python expat library

[Yoshitaka Aharen]

Hello,

I've tried to test trac2157_merge on buildbots, and some of them have
failed to build. They're caused by missing expat module in python.
It didn't import expat directly but the standard library xml.dom.minidom
implicitly imports it. src/bin/auth/gen-statisticsitems.py uses
xml.dom.minidom for parseString.

While the other platforms succeed to build, I'd propose to add a
dependency on Python expat library.

On NetBSD6, installing package py31-expat will solve it.
On CentOS5, I guess installing expat-devel and rebuilding Python 3.1
will solve it.

Regards,

-- 
Yoshitaka Aharen <aharen at jprs.co.jp>
Japan Registry Services Co., Ltd.