[jdk13u-dev] RFR: 8238386: (sctp) jdk.sctp/unix/native/libsctp/SctpNet.c "multiple definition" link errors with GCC10

[Yuri Nesterenko]

need to backport here, too. A copyright digit adjusted.

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Commit messages:
 - Backport 1d42f083c1b64e68eec19471c3f7045c6cbc841f

Changes: https://git.openjdk.org/jdk13u-dev/pull/363/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk13u-dev&pr=363&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8238386
  Stats: 15 lines in 2 files changed: 7 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk13u-dev/pull/363.diff
  Fetch: git fetch https://git.openjdk.org/jdk13u-dev pull/363/head:pull/363

PR: https://git.openjdk.org/jdk13u-dev/pull/363