[PATCHES] Fix build errors and sandbox bugs in the Solaris port

[Poul-Henning Kamp]

In message <500801FD.2030403 at uplex.de>, Geoff Simmons writes:

>Hello all,
>
>The three enclosed patches from slink (who sends his best wishes)
>correct build errors and sandbox (privilege separation) bugs in the
>Solaris port, to be applied to the current master branch.

Hi Geoff & Slink

I have committed part 1, and generalized the idea in part 3 but
not attempted to implement the solaris sandbox with it, but I
hope it makes it easier to do so for you guys.

Tollef promised to do part 2

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