RFR: CODETOOLS-7903305: Remove dead/broken code i18ncheck

[Jonathan Gibbons]

Please review a trivial change to remove a dead/broken file that long ago was used to check resources in I18N resource files.

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Commit messages:
 - CODETOOLS-7903305: Remove dead/broken code i18ncheck

Changes: https://git.openjdk.org/jtreg/pull/121/files
 Webrev: https://webrevs.openjdk.org/?repo=jtreg&pr=121&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903305
  Stats: 335 lines in 1 file changed: 0 ins; 335 del; 0 mod
  Patch: https://git.openjdk.org/jtreg/pull/121.diff
  Fetch: git fetch https://git.openjdk.org/jtreg pull/121/head:pull/121

PR: https://git.openjdk.org/jtreg/pull/121