[jdk13u-dev] Integrated: 8244853: The static build of libextnet is missing the JNI_OnLoad_extnet function

[Yuri Nesterenko]

I'd like to port this fix for general alignment with other release trains. The patch goes clean.

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Commit messages:
 - Backport 3d50f242c2172c05b74e533962195bc8d9ea2997

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/182/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=182&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8244853
  Stats: 15 lines in 3 files changed: 15 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/182.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/182/head:pull/182

PR: https://git.openjdk.java.net/jdk13u-dev/pull/182