<i18n dev> RFR: 8359068: Remove the unused Cstyle code in GenerateCharacter

[Shaojin Wen]

According to the suggestions of @cl4es and @naotoj, Cstyle is no longer used in GenerateCharacter, so remove the Cstyle related code.

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Commit messages:
 - remove `Csyntax`

Changes: https://git.openjdk.org/jdk/pull/25480/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25480&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8359068
  Stats: 38 lines in 1 file changed: 0 ins; 14 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/25480.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25480/head:pull/25480

PR: https://git.openjdk.org/jdk/pull/25480