[jdk17u-dev] RFR: 8301269: Update Commons BCEL to Version 6.7.0

[Goetz Lindenmaier]

One of the required updates of external libs.
I had to resolve Const.java and ConstantDynamic.java because "8294618: Update openjdk.java.net => openjdk.org" is not in 17.

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Commit messages:
 - Remove whitespace
 - Add forgotten files
 - Backport 6a44120a16d0f06b4ed9f0ebf6b0919da7070287

Changes: https://git.openjdk.org/jdk17u-dev/pull/1610/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1610&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301269
  Stats: 30506 lines in 334 files changed: 9313 ins; 10824 del; 10369 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1610.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1610/head:pull/1610

PR: https://git.openjdk.org/jdk17u-dev/pull/1610