BUG/MINOR: don't ignore SIG{BUS,FPE,ILL,SEGV} during signal processing

We don't have any reason of blocking those signals.

If SIGBUS, SIGFPE, SIGILL, or SIGSEGV are generated while they are blocked, the
result is undefined, unless the signal was generated by kill(2), sigqueue(3), or
raise(3).

This should be backported to 1.8.
1 file changed