Integrate perlio:
Jarkko Hietaniemi [Fri, 19 Jan 2001 01:49:56 +0000 (01:49 +0000)]
[  8475]
Win32 "safe signals" co-existance fix.
Fix SIG_SIZE value.
Clear PL_sig_pending when cloning (fork).

p4raw-link: @8475 on //depot/perlio: 66fe0623488f98a7806a1e9f1451648932318696

p4raw-id: //depot/perl@8477


Trivial merge