[jdk17u-dev] RFR: 8278172: java/nio/channels/FileChannel/BlockDeviceSize.java should only run on Linux

[Goetz Lindenmaier]

I backport this for parity with 17.0.3-oracle.

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Commit messages:
 - Backport 0d938cedcaf55886058b94dc280a8f7181c79fdf

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/55/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=55&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278172
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/55.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/55/head:pull/55

PR: https://git.openjdk.java.net/jdk17u-dev/pull/55