RFR: JDK-8289541 : Update ICU4C to 71.1 [v6]

[Johan Vos]

On Wed, 21 Sep 2022 16:32:09 GMT, Hima Bindu Meda <hmeda at openjdk.org> wrote:

>> Updated icu to v71.1.
>> Verified build and sanity testing on windows,Mac and Linux.
>> Removed icu directory from Source/WTF, as the functionality is already provided by Source/ThirdParty/icu
>
> Hima Bindu Meda has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Space corrections

Looking good on win/linux/mac

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Marked as reviewed by jvos (Reviewer).

PR: https://git.openjdk.org/jfx/pull/893