bug#12446: port better to POSIX hosts lacking _setjmp

[Eli Zaretskii]

> Date: Sat, 15 Sep 2012 00:10:04 -0700
> From: Paul Eggert <eggert@cs.ucla.edu>
> CC: Eli Zaretskii <eliz@gnu.org>, lekktu@gmail.com
> 
> I installed this into the trunk as bzr 110035

As you might have expected, it broke the MS-Windows build.  Fixed in
revision 110036 on the trunk.

> and am marking the bug as done.

If you know that your commit needs a followup in ports you don't care
about and didn't included in the changes, please in the future don't
mark the bug as done, as it might need more discussions and changes.