Integrate perlio:

[ 14563]
More Encode tweaks:
- make expensive and marginal substring search optional (-O)
- enable -O for ASCII-oid encodings (search space is small)
- add ASCII-oid jis0201 to basic Encode.so
- add some other Japanese encodings to EUC_JP bundle (without -O)

p4raw-link: @14563 on //depot/perlio: 4cfc977cb33a032e78e373bce7db50a1970926f3

p4raw-id: //depot/perl@14564

diff --cc ext/Encode/compile
Simple merge