Patch by Gustavo Zacarias <gustavo@zacarias.com.ar>
Closes#145.
Current bind package is version 9.3.2 which is from the 9.3 branch and is
EOLed. It has many security bugs probably fixed in 9.3.6-P1 but since it
won't be supported for long it's probably metter to move on to a supported
branch. CVE-2009-0025, CVE-2008-1447, CVE-2008-0122, CVE-2007-2926 and
probably more. While at it migrate to Makefile.autotools.in too. Also
introduced an option for/not to install userland tools (dig, host, nslookup,
nsupdate).
[ Peter: don't install into staging ]
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