Revert dbaf2f1a92f6 and instead move initialization of "coherence" to

emu/NetBSD/os.c

As explained in inferno-os issue 335:

> The definition of coherence deliberately takes advantage of a C rule
> to avoid anyone having to change an existing fork of emu (eg, for a
> new platform), to account for the arrival of "coherence".  If a
> given port doesn't define it, it will be nil and main will fill it
> in.  If as on Windows or now NetBSD, it needs to be defined from the
> start, the os.c for that platform should do it, but still no other
> platforms need source changes.

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