RFR: 8342086: FileInputStream.available() fails with "Incorrect function" for "nul" path (win)

[Brian Burkhalter]

Modify the `handleAvailable` native code path to ignore an `ERROR_INVALID_FUNCTION` encountered by `PeekNamedPipe` and update an existing test to verify this change.

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Commit messages:
 - 8342086: FileInputStream.available() fails with "Incorrect function" for "nul" path (win)

Changes: https://git.openjdk.org/jdk/pull/21543/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21543&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342086
  Stats: 34 lines in 2 files changed: 17 ins; 0 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/21543.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21543/head:pull/21543

PR: https://git.openjdk.org/jdk/pull/21543