[Bug 206503] [exp-run] Correct type of 'ss_sp' in stack_t and struct sigstack

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206503

            Bug ID: 206503
           Summary: [exp-run] Correct type of 'ss_sp' in stack_t and
                    struct sigstack
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
               URL: https://github.com/freebsd/freebsd/compare/master...bs
                    djhb:sigstack_void.diff
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: jhb at FreeBSD.org
                CC: freebsd-ports-bugs at FreeBSD.org

POSIX requires the 'ss_sp' fields in 'stack_t' (used with sigaltstack(2)) and
'struct sigstack' (used with sigstack(2)) to be declared as 'void *':

http://pubs.opengroup.org/onlinepubs/7908799/xsh/signal.h.html

However, FreeBSD defines these as 'char *' (and inherited this from 4BSD).

NetBSD changed their ss_sp to void * back in 1998 (1.27 of signal.h).  OpenBSD
followed suit in 1.9 of their signal.h.

I suspect if anything this should reduce breakage in 3rd party software, but an
exp-run can't hurt.

The patch is contained in the URL.  The majority of the patch is fixes to the
kernel to compile with the change.  Only the change to sys/sys/signal.h is
visible to userland, so you only need a new world with the patched signal.h for
an exp-run.

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