Integrate perlio:

Integrate perlio:

[  9442]
Work in progress - determine win32 extensions to build via script.

[  9435]
Win32 has name conflict with ERROR

[  9432]
Make as-shipped compiler default to MSVC6

[  9431]
Allow someone to write PerlIO::Array, PerlIO::Code, ...
akin to PerlIO::Scalar.

[  9429]
Noticed that two tests were skipped as perlio:: package
isn't there any more. Changed the skip condition.
Avoid core-dump if sv_utf8_upgrade() called on something
that does not become SvPOK after SvPV() (e.g. a ref).

p4raw-link: @9442 on //depot/perlio: 17af6fb0658e86e2f4a472e3392fc688e0c25b43
p4raw-link: @9435 on //depot/perlio: c7997937a3d3c62c11d46b84cf8e39979d05cd2e
p4raw-link: @9432 on //depot/perlio: f3ee62dd045665d69979ecdae282e2285af75e52
p4raw-link: @9431 on //depot/perlio: 2edd7e4402b46befc69c68043eda73146c6036b0
p4raw-link: @9429 on //depot/perlio: e0e62c2a4ed4c005b9afcfe9fe3e1838fcea785d

p4raw-id: //depot/perl@9443