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ARROW-17163: [C++] Revert installation of jni_util.h (#13675)

PR #13614 installed jni_util.h to match earlier behavior, but
the downstream Gluten project is no longer depending on it and
we never intended to expose this header, so don't install it.

Authored-by: David Li <li.davidm96@gmail.com>
Signed-off-by: David Li <li.davidm96@gmail.com>