When compiling jack on aarch64, compilation fails because NGREGS is not
defined. Since this is only for debug output on segmentation faults, stub
the debug print out like it's been done for other platforms before.

Signed-off-by: Alexander Graf <agraf@suse.de>

Patch provided by Aurelien Jarno <aurel32@debian.org> in
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684470

SA_SIGINFO isn't defined on hurd, so check before setting it.

This patch was used in Debian since 2010-08-01.

In my case, the siginfo code was -6, causing the sigsegv handling
to crash on its own. This patch adds a range check for siginfo code.

BugLink: https://bugs.launchpad.net/bugs/983835
Signed-off-by: David Henningsson <david.henningsson@canonical.com>

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@4675 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: http://subversion.jackaudio.org/jack/jack2/branches/libjacknet@4042 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@4034 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: http://subversion.jackaudio.org/jack/jack2/branches/libjacknet@4005 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@3995 0c269be4-1314-0410-8aa9-9f06e86f4224

The revert in r3818 was wrong because r3816 was correct in svn.
The revert error in r3818 happened,
because svn r3816 had wrong git version 9fb8b55379
the right git version of svn r3816 is c9bbc68a8d

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@3820 0c269be4-1314-0410-8aa9-9f06e86f4224

That changeset is supposed to only patch Jackdmp.cpp

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@3818 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: http://subversion.jackaudio.org/jack/jack2/branches/libjacknet@3814 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@3811 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@2880 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@2537 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@2423 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@2379 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@2378 0c269be4-1314-0410-8aa9-9f06e86f4224