RFR: JDK-8289541 : Update ICU4C to 71.1 [v5]

[Hima Bindu Meda]

> 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:

  Update icu_web.md

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/893/files
  - new: https://git.openjdk.org/jfx/pull/893/files/c9678a25..22c8e530

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=893&range=04
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=893&range=03-04

  Stats: 102 lines in 1 file changed: 37 ins; 65 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/893.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/893/head:pull/893

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