RFR: 8274562: (fs) UserDefinedFileAttributeView doesn't correctly determine if supported when using OverlayFS

[Dmor01]

On Thu, 30 Sep 2021 21:03:14 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Add extended attributes to capabilities flag if `_SYS_XATTR_H` is defined.

@bplb would it be possible to get the fix for 8274562 backported to JDK17?

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PR: https://git.openjdk.java.net/jdk/pull/5782