RFR: 8282515: More clean up on NativeLibraries just for JNI library use

[Mandy Chung]

On Wed, 2 Mar 2022 17:04:01 GMT, Mandy Chung <mchung at openjdk.org> wrote:

> This patch further cleans up NativeLibraries just for JNI library use.  RawNativeLibraries implements its own native load and unload methods.  In addition, this also fixes the implementation of `RawNativeLibraries::load` not to throw UnsatisfiedLinkError if a library cannot be loaded for any reason but instead returns null.

Thanks for the review.

I also think this is better and cleaner separation.   The duplicated native code is small and they just call `JVM_LoadLibrary` and `JVM_UnloadLibrary` that makes it very clear what this native method does.

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PR: https://git.openjdk.java.net/jdk/pull/7661