[jdk11u-dev] RFR: 8228403: SignTwice.java failed with java.io.FileNotFoundException: File name too long

[Goetz Lindenmaier]

I backport this for parity with 11.0.21-oracle.

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Commit messages:
 - Backport 804e840856d7593eb64faa7c84a4b02397af0bc7

Changes: https://git.openjdk.org/jdk11u-dev/pull/2005/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2005&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8228403
  Stats: 50 lines in 2 files changed: 30 ins; 5 del; 15 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2005.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2005/head:pull/2005

PR: https://git.openjdk.org/jdk11u-dev/pull/2005