RFR: 8289073: (fs) UnsatisfiedLinkError for sun.nio.fs.UnixCopyFile.bufferedCopy0()

[Brian Burkhalter]

Change C function from `Java_sun_nio_fs_UnixCopyFile_bufferCopy0` to `Java_sun_nio_fs_UnixCopyFile_bufferedCopy0`.

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Commit messages:
 - 8289073: (fs) UnsatisfiedLinkError for sun.nio.fs.UnixCopyFile.bufferedCopy0()

Changes: https://git.openjdk.org/jdk/pull/9262/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9262&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289073
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9262.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9262/head:pull/9262

PR: https://git.openjdk.org/jdk/pull/9262