The patch does the following:

The patch does the following:
- Nix the unneccessary diagnostics line
- Quell -w warnings if the first ENV doesn't exist
- While zh_CN means euc-cn, zh_TW almost invariably mean big5, as euc-tw
  is too baroque and bloated for daily use (and for perl core inclusion).
- "Cannot figure out an encoding to use" when locale is 'C' is rendered
  non-fatal.
- Consequently, the ^OPEN bits is set only when needed.

p4raw-id: //depot/perl@15142