removing SVR4 binary compatibilty layer

[Poul-Henning Kamp]

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In message <20170215081430.GC58829 at FreeBSD.org>, Gleb Smirnoff writes:

>Well, we all "maintain" it, meaning that we keep it compilable. However,
>I'm sure that no one checks the functionality. There are no regression
>tests, and seems to be no users.

And probably nobody ever bothered to check the code comprehensively
for security risks...

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.