RFR: 8232861: (fc) FileChannel.force fails on WebDAV file systems (macOS)

[Brian Burkhalter]

Apparently `fcntl(fd, F_FULLFSYNC)` can fail with `ENOTTY` in addition to `ENOTSUP` although it is not so documented. The `ioctl()` case is documented as
[ENOTTY]       fildes is not associated with a character special
               device.
[ENOTTY]       The specified request does not apply to the kind of
               object that the descriptor fildes references.

This request proposes to catch `ENOTTY` as well and fall back to `fsync(fd)`. The change was verified manually using a WebDAV server and no failures in CI test tiers 1-3 were observed. An alternative would be to fall back to `fsync(fd)` for **all** errors.

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Commit messages:
 - 8232861: (fc) FileChannel.force fails on WebDAV file systems (macOS)

Changes: https://git.openjdk.java.net/jdk/pull/3366/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3366&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8232861
  Stats: 5 lines in 1 file changed: 2 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3366.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3366/head:pull/3366

PR: https://git.openjdk.java.net/jdk/pull/3366