Integrate perlio:

Integrate perlio:

[  7844]
Win32/perlio Now just fails one io/argv.t test - lack
of default :crlf on standard streams.

[  7843]
Win32 passes all but t/lib/peek.t with perlio and home-grown crlf.
peek fail is showing a real problem (multiple crlf layers
are getting pushed.)

[  7842]
Implement PerlIO_binmode()
Fix PerlIOCrlf_unread() (*--ptr rather than *ptr-- ...)
Test on UNIX with PERLIO="perlio crlf" to mimic Win32,
make binmode in t/lib/io_tell.t unconditional so that works.
Checkin just so Win32 machine can see these changes.

[  7836]
Implement crlf layer - not ready for merge.

p4raw-link: @7844 on //depot/perlio: de6cd452fde5aaf57e339f71b33b6a0852f0f96d
p4raw-link: @7843 on //depot/perlio: 63dbdb066b93ac25a070d3a7942d248c23ec6088
p4raw-link: @7842 on //depot/perlio: 60382766f71ec2a2d8e34a951c5c77b494bd86bb
p4raw-link: @7836 on //depot/perlio: 99efab1281ccea6f7df2a4d0affc5479291e2350

p4raw-id: //depot/perl@7847