[jdk21u-dev] RFR: 8342270: Test sun/security/pkcs11/Provider/RequiredMechCheck.java needs write access to src tree

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle.

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Commit messages:
 - Backport 342fe42555a0e892d21d187287ab996be199abb1

Changes: https://git.openjdk.org/jdk21u-dev/pull/1263/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1263&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342270
  Stats: 33 lines in 2 files changed: 28 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1263.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1263/head:pull/1263

PR: https://git.openjdk.org/jdk21u-dev/pull/1263