[9] RFR of 8065595: Wrong JNI_OnLoad called if just loaded lib does not have JNI_OnLoad function

[Brian Burkhalter]

Please review at your convenience.

Issue:	https://bugs.openjdk.java.net/browse/JDK-8065595
Patch:	http://cr.openjdk.java.net/~bpb/8065595/webrev.00/

Summary:

Add nio_util.c containing JNI_OnLoad [1] bare bones implementation. The jdk_nio regression tests pass on all affected platforms, i.e., the usual targets.

Thanks,

Brian

[1] http://docs.oracle.com/javase/8/docs/technotes/guides/jni/spec/invocation.html#JNJI_OnLoad