[jdk8u-dev] RFR: 8287463: JFR: Disable TestDevNull.java on Windows [v7]

[Jiří Vaněk]

> 8287463: JFR: Disable TestDevNull.java on Windows

Jiří Vaněk has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:

 - Moved to  @requires (os.family != "windows") instead of Platfrom
 - Used jdk.test.lib.Platform instead of testlib
 - Get rid of testlib
 - Moved to testlibray's  paltfrom isntead of custom proeprty chekcing
 - 8287463: JFR: Disable TestDevNull.java on Windows

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Changes: https://git.openjdk.org/jdk8u-dev/pull/255/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=255&range=06
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/255.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/255/head:pull/255

PR: https://git.openjdk.org/jdk8u-dev/pull/255