[jdk11u-dev] RFR: 8298271: java/security/SignedJar/spi-calendar-provider/TestSPISigned.java failing on Windows

[Severin Gehwolf]

Not clean backport, because the problem list bug [JDK-8298274](https://bugs.openjdk.org/browse/JDK-8298274) won't get backported. Omitted the ProblemList.txt hunk. Instead I propose to backport the fix (this PR) instead. Follow up for #1608 in order to fix the test on Windows.

Please review this test-only backport. Thanks!

Test passes with the fix of https://github.com/openjdk/jdk11u/pull/65 included.

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Depends on: https://git.openjdk.org/jdk11u-dev/pull/1608

Commit messages:
 - 8298271: java/security/SignedJar/spi-calendar-provider/TestSPISigned.java failing on Windows

Changes: https://git.openjdk.org/jdk11u-dev/pull/1609/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1609&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298271
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1609.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1609/head:pull/1609

PR: https://git.openjdk.org/jdk11u-dev/pull/1609