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Dropping privileges in various translators

Hi folks :)

this is a patch series adding setnullauth () to libshouldbeinlibc and
demonstrating its use for dropping unix privileges in the null and
tmpfs translators. A nullauth utility is provided to start arbitrary
programs without any privileges. This can be used to run the
translator on /dev/zero without privileges.

Relevant bug reports:

* https://savannah.gnu.org/bugs/?13398
* http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=313560


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