RFR: 8286176: Add JNI_VERSION_19 to jni.h and JNI spec

[Alan Bateman]

On Tue, 14 Jun 2022 12:19:29 GMT, David Holmes <dholmes at openjdk.org> wrote:

> @AlanBateman sorry I missed your statement "although these updates aren't strictly needed".

Right, I decided it would be better to just update them rather than leaving them at _10. For the management agent then JNI_OnLoad returning any supported version will do as we build/test is separating to the rest of the JDK. Same thing for the tests. Someone back porting changes might have to adjust of course but the isn't important here.

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PR: https://git.openjdk.org/jdk19/pull/7