[jdk17u-dev] RFR: 8271003: hs_err improvement: handle CLASSPATH env setting longer than O_BUFLEN

[Goetz Lindenmaier]

A clean backport to improve hs_err file.

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Commit messages:
 - Backport 3435d299f76ada66e7b7cb42d9f0265cf99a30ca

Changes: https://git.openjdk.org/jdk17u-dev/pull/2923/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2923&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8271003
  Stats: 86 lines in 2 files changed: 85 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2923.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2923/head:pull/2923

PR: https://git.openjdk.org/jdk17u-dev/pull/2923