RFR: 8260245: Update ICU4C to version 68.2 [v2]

[Arun Joseph]

> We currently use ICU4C version 64.2. We should update to the latest stable version 68.2.
> http://site.icu-project.org/home

Arun Joseph has updated the pull request incrementally with one additional commit since the last revision:

  Add icuVersion

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/456/files
  - new: https://git.openjdk.java.net/jfx/pull/456/files/c66fbd74..351e02b9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=456&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=456&range=00-01

  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jfx/pull/456.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/456/head:pull/456

PR: https://git.openjdk.java.net/jfx/pull/456