Build a JVM-compatible version of libnativehelper

libnativehelper is used for some common methods involving communication
between the Java and native parts of Android. Some of those methods are
specialized for ART and do not work on a JVM (due to some API
differences between ART and JVM).
libnativehelper_jvm implements the same methods in a JVM-compatible way,
so that it can be used whenever a library is meant to be run on a host
JVM.

Bug: 322360037
Test: build libnativehelper_jvm on host
Change-Id: I6aa72b3f69fe2df946febcc5eaa6e734448c70af