Leftover cruft for OPENBSD

[Eric S. Raymond]

Hal Murray <hmurray at megapathdsl.net>:
> wscript says:
>     # XXX: needed for ntp_worker, for now
>     if ctx.env.DEST_OS == "openbsd":
>         ctx.define("PLATFORM_OPENBSD", "1", quote=False)
> 
> Also mentioned in ./devel/ifdex-ignores
> 
> It's not needed any more.  Do you want to kill it now, or wait until post 
> release?

It's safe to remove now, since no code is conditional on it.  I'll do it.
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		<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>

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