RFR: 8319571: Update jni/nullCaller/NullCallerTest.java to accept flags or mark as flagless

[Tim Prinzing]

Marked as flagless.

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Commit messages:
 - 8319571: Update jni/nullCaller/NullCallerTest.java to accept flags or mark as flagless

Changes: https://git.openjdk.org/jdk/pull/16711/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16711&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319571
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/16711.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16711/head:pull/16711

PR: https://git.openjdk.org/jdk/pull/16711