Integrate perlio:

[ 14432]
Gurusamy Sarathy <gsar@ActiveState.com>'s patch to Filter::Simple
for CRLF line endings.

[ 14431]
Fix/band-aid for op.c's anon CV leak fix co-existing with threads.
Should really be looked at by someone that knows about pads.

[ 14429]
Tinkering with thread cleanup mutex-ing - not the problem
(op.c is) but could have been...

[ 14428]
Win32 signal emulation cleanup.

[ 14427]
If we get to sighandler by mistake (no perl handler set) then
warn() and exit() rather than die() - should never happen
but if it does context needed to die is likely to be trashed
as well.

[ 14425]
1st two tests of File/Find/t/find.t and taint.t were run after
calling cleanup(). If previous fail had left for_find directory,
but no content in it then cleanup() returned cd'ed to that directory.
So tests failed. Fixed cleanup()-s.

p4raw-link: @14432 on //depot/perlio: 126dd235999b6580f8d629a35f0e2b2d32077c88
p4raw-link: @14431 on //depot/perlio: b2ffa427d7575253c5d33c9ca199b5fd47e45f71
p4raw-link: @14429 on //depot/perlio: d1400e48e158e209536db79ab608532be0d8d7e2
p4raw-link: @14428 on //depot/perlio: 3fadfdf11dfb17421538d2f4280b4d99a5c6cb5a
p4raw-link: @14427 on //depot/perlio: 727405f80c5904bbe9e96e63570ee4516290a454
p4raw-link: @14425 on //depot/perlio: 6455dd3b380c55881cdb4351b263c15bfadaac71

p4raw-id: //depot/perl@14433