[Pkg-postgresql-public] disable sysctl stuff on non-linux

[Christoph Berg]

Re: Peter Eisentraut 2013-04-09 <1365476301.3290.11.camel at vanquo.pezone.net>
> Oops, sorry.  I guess the proper way to do this might be via ucf, but
> that doesn't seem worth it.  In the long term (PG 9.3), the need for
> this file will go away anyway.

Yeah, good point, lets just leave it as it is until we can remove the
file. (Though support for < 9.3 will continue to be there for years.)

Christoph
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