[jdk11u-dev] RFR: 8290197: test/jdk/java/nio/file/Files/probeContentType/Basic.java fails on some systems for the ".rar" extension

[Goetz Lindenmaier]

I backport this for parity with 11.0.19-oracle.

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Commit messages:
 - Backport 44fb92e2aa8a708b94c568e3d39217cb4c39f6bf

Changes: https://git.openjdk.org/jdk11u-dev/pull/1783/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1783&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290197
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1783.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1783/head:pull/1783

PR: https://git.openjdk.org/jdk11u-dev/pull/1783