Pull up following revision(s) (requested by mrg in ticket #1479):
sys/compat/svr4/svr4_lwp.c: 1.20
sys/compat/svr4/svr4_signal.c: 1.67
sys/compat/svr4/svr4_stream.c: 1.89-1.91 via patch
sys/compat/svr4_32/svr4_32_signal.c: 1.29
Fix some of the multitudinous holes in svr4 streams.
We should never have enabled this by default; it is a minefield.
From Ilja Van Sprundel.
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Zero stack data before copyout.
From Ilja Van Sprundel.
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Fix indexing of svr4 signals.
From Ilja Van Sprundel.
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Feebly attempt to get this reference counting less bad.
This svr4 streams code is bad and it should feel bad.
From Ilja Van Sprundel.
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Check bounds in svr4_sys_putmsg.  Check more svr4_strmcmd bounds.
svr4 streams code is still a disaster.
From Ilja Van Sprundel.

(snj)