RFR: 8321373: Build should use LC_ALL=C.UTF-8 [v2]

[Magnus Ihse Bursie]

> We're currently setting LC_ALL=C. Not all tools will default to utf-8 as their encoding of choice when they see this locale, but use an arbitrarily encoding, which might not properly handle all UTF-8 characters. Since in practice, all our encoding is utf8, we should tell our tools this as well.
> 
> This will at least have effect on how Java treats path names including unicode characters.

Magnus Ihse Bursie has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Explicitly load StandardCharsets ascii/utf-8 in HelloClasslist
 - Merge branch 'master' into c.utf-8
 - 8321373: Build should use LC_ALL=C.UTF-8

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/16971/files
  - new: https://git.openjdk.org/jdk/pull/16971/files/5197845b..d5f5a257

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16971&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16971&range=00-01

  Stats: 108961 lines in 2375 files changed: 61009 ins; 38143 del; 9809 mod
  Patch: https://git.openjdk.org/jdk/pull/16971.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16971/head:pull/16971

PR: https://git.openjdk.org/jdk/pull/16971