Integrate perlio:

[  9351]
Fix readline in list mode to tell rest of world that it has
things on the stack. Otherwise if perl code gets invoked
underneath it it scribbles over results-so-far.
(Why TIEHANDLE has not tripped on this is a mystery.)

[  9350]
win32/makefile.mk typos

[  9348]
Make it text

[  9346]
Add destruct time hook to PerlIO (for work-in-process implementing
layers in perl code. In such cases layers need to be popped before
we loose the ability to run perl code.)
Also back-out "PerlIO::object" hook - it isn't going to work like that...

[  9345]
Avoid at leasy one of undefined warnings in Encode.

[  9343]
Missing return value.

p4raw-link: @9351 on //depot/perlio: 09e8efccba1f47d53c182ecd6161dfcbbbc53b0f
p4raw-link: @9350 on //depot/perlio: 2590d28705872a65d11745576d64aa79a6c9cdfe
p4raw-link: @9348 on //depot/perlio: e8c26a5fe91df45297036573f4007ab8d23de7e9
p4raw-link: @9346 on //depot/perlio: 13621cfb31449eed71b690b723c2463019b1b277
p4raw-link: @9345 on //depot/perlio: 8040349a05f5a3f1e93bde55d8359e415c47bf01
p4raw-link: @9343 on //depot/perlio: a144b9898613715625621889c13893a8238e4af6

p4raw-id: //depot/perl@9353