RFR: 8365559: jarsigner shows files non-existent if signed with a weak algorithm

[Weijun Wang]

See the bug report for details. Basically, entries in the SF set should always be removed no matter if it's treated signed or not.

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Commit messages:
 - the fix

Changes: https://git.openjdk.org/jdk/pull/26781/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26781&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365559
  Stats: 34 lines in 2 files changed: 29 ins; 3 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/26781.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26781/head:pull/26781

PR: https://git.openjdk.org/jdk/pull/26781