devel/py-freebsd and deprecation of jail(2)

[James Gritton]

Hello,

I'd like to have jsil(2) moved to COMPAT_FREEBSD11 for the release of 
12.0, which means that userspace utilities will need to be moved off of 
jail(2) and onto jail_set(2).

In the case of py-freebsd, the PyFB_jail function uses the old jail(2) 
interface.  It's simple enough to change that to use jail_setv(3) 
instead, and add libjail.  Perhaps it would be better to add a new 
function for a more complete interface to jail_set(2), but that's beyond 
the scope of just making sure the program doesn't stop working.  
Considering it uses Python 2.7, I don't know if there's much interest in 
updating its functionality.

I'm including an updated version of patch-src-jail.c, as well as a new 
patch-src-.libraries.def - but I don't know how to make the later patch 
actually get used; so all I can say right now is this ought to work if I 
knew how to get the patches right.

Thanks,
  Jamie
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