Emacs should now build correctly on GNU/Hurd.

Emacs should now build correctly on GNU/Hurd.

Applied upstream patch:

  * sysdep.c: Remove a use of BSD_SYSTEM, which I'm trying to phase out.

  Include <sys/param.h> unconditionally, as that works elsewhere and
  is simpler here.  Include <sys/sysctl.h> if DARWIN_OS ||
  __FreeBSD__, not if BSD_SYSTEM, since it's needed only for Darwin
  and FreeBSD now.

Origin: upstream, commit: 112030, f83f57c2e20531ff3442904bc450607db19e999c
Added-by: Rob Browning <rlb@defaultvalue.org>
Provided-By: Paul Eggert  <eggert@cs.ucla.edu>
Bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=725099