RFR: 6633375: FileOutputStream_md.c should be merged into FileOutputStream.c

[Naoto Sato]

On Thu, 24 Jun 2021 20:01:27 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Merge identical Unix and Windows versions of FileOutputStream_md.c into single, common FileOutputStream.c.

Looks good. Would you consider removing `fos_fd` and passing it as a `jlong` as suggested in the issue?

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PR: https://git.openjdk.java.net/jdk/pull/4589