RFR: 8337143: (fc, fs) Move filesystem-related native objects from libnio to libjava [v5]

[Brian Burkhalter]

> This proposed change would move the native objects required for NIO file interaction from the libnio native library to the libjava native library on Linux, macOS, and Windows.

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

  8337143: Remove loading libnet from Inet6AddressImpl; delete commented out #include in Windows IOUtil.c

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20317/files
  - new: https://git.openjdk.org/jdk/pull/20317/files/e28a4f57..f57b6f13

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20317&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20317&range=03-04

  Stats: 11 lines in 3 files changed: 4 ins; 5 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/20317.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20317/head:pull/20317

PR: https://git.openjdk.org/jdk/pull/20317