[jdk15u-dev] Integrated: 8247753: UIManager.getSytemLookAndFeelClassName() returns wrong value on Fedora 32

[Yuri Nesterenko]

This port of a change necessary for  newer Gnome is clean on jdk15.

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Commit messages:
 - Backport 79a4a019bba1c99bef2377fe88f1464943530a55

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/27/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=27&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8247753
  Stats: 33 lines in 2 files changed: 12 ins; 0 del; 21 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/27.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/27/head:pull/27

PR: https://git.openjdk.java.net/jdk15u-dev/pull/27