RFR: 8260193: Remove JVM_GetInterfaceVersion() and JVM_DTraceXXX [v2]

[Gerard Ziemski]

On Mon, 1 Feb 2021 20:10:58 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> - JVM_GetInterfaceVersion() was used by "HotSpot Express" (HSX) which allowed the same JDK library to use different version of HotSpot. However, HSX is no longer supported so this API should be removed.
>> - Implementations of APIs such as JVM_DTraceActivate, were removed in [JDK-8068976](https://bugs.openjdk.java.net/browse/JDK-8068976), so their declarations should be removed from jvm.h
>
> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fixed macos build

Changes requested by gziemski (Committer).

src/java.base/share/native/libjava/check_version.c line 33:

> 31: DEF_JNI_OnLoad(JavaVM *vm, void *reserved)
> 32: {
> 33:     return JNI_VERSION_1_2;

This leaves an entire file with one trivial function implementation. Can we remove the file and implement  `DEF_JNI_OnLoad()` in `jni_util.h` (or some other existing suitable file) ?

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PR: https://git.openjdk.java.net/jdk/pull/2338