RFR: 8290488: IBM864 character encoding implementation bug

[Naoto Sato]

On Thu, 28 Jul 2022 00:58:59 GMT, Ichiroh Takiguchi <itakiguchi at openjdk.org> wrote:

>> Adding an extra c2b mapping for the `%` in `IBM864` charset. The discrepancy came from the mapping difference between MS and IBM.
>
> Hello @naotoj .
> I'm not reviewer, but I'd like to test this change.
> Could you wait for a moment ?
> Thanks.

@takiguc Sure. Appreciate it.

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PR: https://git.openjdk.org/jdk/pull/9661