RFR: 8305809: (fs) Review obsolete Linux kernel dependency on os.version (Unix kernel 2.6.39) [v3]

[Brian Burkhalter]

> Remove contingency on Linux kernel version of return value of `LinuxFileStore::supportsFileAttributeView` for ext4 file systems.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8305809: Remove vestigial import of java.util.regex.Pattern

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13412/files
  - new: https://git.openjdk.org/jdk/pull/13412/files/1a6ac5c1..ee8c4b10

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13412&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13412&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13412.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13412/head:pull/13412

PR: https://git.openjdk.org/jdk/pull/13412