RFR: 8337966: Verify statx permissions

[Alexey Bakhtin]

Please review the fix for regression on the old docker versions (before v18.04)

Suggest to verify if statx is permitted during initialization

statx(-1, "", AT_EMPTY_PATH, 0, &statx_buf) return EPERM if statx syscall not permitted and EBADF otherwise

Fallback to stat() if statx() not permitted

Related  jtreg tests passed

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Commit messages:
 - 8337966: Verify statx permissions

Changes: https://git.openjdk.org/jdk/pull/20484/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20484&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337966
  Stats: 8 lines in 1 file changed: 7 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20484.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20484/head:pull/20484

PR: https://git.openjdk.org/jdk/pull/20484