[jdk17u-dev] RFR: 8267138: Stray suffix when starting gtests via GTestWrapper.java

[Thomas Stuefe]

Hi all,

Backported since the underlying issue is suspected of causing rare windows gtests errors in JDK17.

This pull request contains a backport of commit [b565459f](https://github.com/openjdk/jdk/commit/b565459f83b749a01d7d873a01bb7dbdf55745de) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Thomas Stuefe on 25 Jun 2021 and was reviewed by Aleksey Shipilev.

Thanks!

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Commit messages:
 - Backport b565459f83b749a01d7d873a01bb7dbdf55745de

Changes: https://git.openjdk.org/jdk17u-dev/pull/822/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=822&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8267138
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/822.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/822/head:pull/822

PR: https://git.openjdk.org/jdk17u-dev/pull/822