RFR: 8367859: Remove shell script from nio exception gensrc

Wed Sep 17 15:14:16 UTC 2025

The only remaining shell script that is being used in the gensrc phase to generate Java code is for the nio exceptions. This should be removed as well, and replaced with a standard solution (Java buildtool or makefile API calls).

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Commit messages:
 - Escape # in literals with \
 - 8367859: Remove shell script from nio exception gensrc

Changes: https://git.openjdk.org/jdk/pull/27338/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27338&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367859
  Stats: 1058 lines in 11 files changed: 531 ins; 525 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/27338.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27338/head:pull/27338

PR: https://git.openjdk.org/jdk/pull/27338