[jdk17u] RFR: 8293965: Code signing warnings after JDK-8293550

[Paul Hohensee]

Clean backport follow-on to [JDK-8293550](https://bugs.openjdk.org/browse/JDK-8293550) 17u backport.

-------------

Commit messages:
 - Backport f91762f56ea7fb27b6fa54d07d3b3b0650bab0bc

Changes: https://git.openjdk.org/jdk17u/pull/360/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u&pr=360&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293965
  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u/pull/360.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u pull/360/head:pull/360

PR: https://git.openjdk.org/jdk17u/pull/360