RFR: 8353053: (fs) Add support for UserDefinedFileAttributeView on AIX [v4]

[Varada M]

> In AIX, the JFS2 supports extended attributes which has fgetea, fsetea, flistea, femoveea APIs support fetching, setting, listing and removing extended attributes. 
> 
> JBS: [JDK-8353053](https://bugs.openjdk.org/browse/JDK-8353053)

Varada M has updated the pull request incrementally with two additional commits since the last revision:

 - 8353053: (fs) Add support for UserDefinedFileAttributeView on AIX
 - 8353053: (fs) Add support for UserDefinedFileAttributeView on AIX

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24276/files
  - new: https://git.openjdk.org/jdk/pull/24276/files/5defce85..d6ef10ea

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24276&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24276&range=02-03

  Stats: 6 lines in 1 file changed: 1 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/24276.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24276/head:pull/24276

PR: https://git.openjdk.org/jdk/pull/24276