Hello,

On GNU/Linux systems, when deliverying a signal, the process is resumed 
at the first instruction of the handler, and not the first instruction 
of the signal trampoline.  This checks that a breakpoint on that first 
handler instruction still works.

Tested on a i386 GNU/Linux, it 1738 kfailed when single-stepping.
Tested on a patched PPC/NetBSD, it passed (doesn't have that feature).

Ok?
Andrew