RFR: 8308046: Move Solaris related charsets from java.base to jdk.charsets module [v3]

[Ichiroh Takiguchi]

> According to "JDK 20 Internationalization Guide"
> https://docs.oracle.com/en/java/javase/20/intl/supported-encodings.html
> Following Solaris related charsets are in "contained in jdk.charsets module" list.
> 
> - PCK (x-PCK)
> - EUC_JP_Solaris (x-eucJP-Open)
> - Big5_Solaris (x-Big5-Solaris)
> 
> These are not supported by Linux platform, so they should not be in java.base module.
> 
> Note:
> GHA Linux x86 builds were failed.
> I think it's not related by my modified code.
> I opened [JDK-8308051](https://bugs.openjdk.org/browse/JDK-8308051) GHA: Linux x86 builds failure

Ichiroh Takiguchi has updated the pull request incrementally with one additional commit since the last revision:

  8308046: Move Solaris related charsets from java.base to jdk.charsets module

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/13973/files
  - new: https://git.openjdk.org/jdk/pull/13973/files/6fd12fcd..1c10b107

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13973&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13973&range=01-02

  Stats: 43 lines in 4 files changed: 0 ins; 29 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/13973.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13973/head:pull/13973

PR: https://git.openjdk.org/jdk/pull/13973