RFR: 8316923: Add DEF_STATIC_JNI_OnLoad for librmi

[Jiangli Zhou]

Please help review this trivial change that adds missing DEF_STATIC_JNI_OnLoad for librmi.

Thanks

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Commit messages:
 - 8316923: Add DEF_STATIC_JNI_OnLoad for librmi

Changes: https://git.openjdk.org/jdk/pull/16020/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16020&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316923
  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/16020.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16020/head:pull/16020

PR: https://git.openjdk.org/jdk/pull/16020