RFR: 8302659: Modernize Windows native code for NetworkInterface [v2]

[Rich DiCroce]

> Improves performance and correctness, as discussed on the net-dev mailing list.

Rich DiCroce has updated the pull request incrementally with one additional commit since the last revision:

  Limit line length to 80-ish characters

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12593/files
  - new: https://git.openjdk.org/jdk/pull/12593/files/311cdc22..b23d139e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12593&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12593&range=00-01

  Stats: 111 lines in 1 file changed: 61 ins; 0 del; 50 mod
  Patch: https://git.openjdk.org/jdk/pull/12593.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12593/head:pull/12593

PR: https://git.openjdk.org/jdk/pull/12593