Integrate perlio:

[  8106]
"Cold" build correction to Encode's Makefile.PL

[  8105]
"Compiled" encodings.
Correct replacement character in EBCDIC .enc files
Add 0x7F to ASCII repertoire.

[  8103]
Beginings of compiled encodings - checked in as a snapshot of thoughts
so far and so it does not get lost.

p4raw-link: @8106 on //depot/perlio: 311a0942a841b9a310fcf53d05fa79c643b68a12
p4raw-link: @8105 on //depot/perlio: 2f2b4ff2c154a8e461857f2e82cb815c238d0d94
p4raw-link: @8103 on //depot/perlio: 017e2addf6da99b3f648d9518de5a848be394ab8

p4raw-id: //depot/perl@8114

diff --cc ext/Encode/Encode.xs
Simple merge