[PATCH] Improve LinuxThreads compatibility in rfork()

[Petr Salinger]

>> I will bump revision for stable/8 when merging, but I do not see much
>> reason to bump on HEAD right now.

Many thanks.

> Uhm I think we can survive without a bump in HEAD.  For now we will
> need to keep our backward-compatibility patch anyway, and when the
> bump happens on stable/8 our sysctl comparison will identify 900039 as
> new ABI.

We cannot survive without a bump in HEAD before 9.0 release,
but we do not need bump immediately.

So far the condition for new API will be

   if (    (osreldate >= 900040)
       || ((osreldate >= 803000) && (osreldate < 900000)))

Of course, when MFC will bump revision, the 803000 constant
will change (probably to 802509).

Petr