[jdk11u-dev] RFR: 8288332: Tier1 validate-source fails after 8279614

[Goetz Lindenmaier]

I backport this for parity with 11.0.19-oracle.

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Commit messages:
 - Backport e90b579b294eb88f6b4e236d19b05063775ee8d7

Changes: https://git.openjdk.org/jdk11u-dev/pull/1745/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1745&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288332
  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1745.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1745/head:pull/1745

PR: https://git.openjdk.org/jdk11u-dev/pull/1745