Add support for NetBSD operating system

Use its own jni_md.h, however it is identical to Linux one.
4 jobs for netbsd in 2 minutes and 27 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
passed #275448
amd64 debian
build-debian

00:01:04

passed #275449
macos
build-macos

00:01:32

passed #275451
win32 amd64 debian
build-win32

00:02:17

passed #275450
win64 amd64 debian
build-win64

00:02:27