RFR: JDK-8189608 Remove duplicated jni.h

Wed Oct 18 08:53:51 UTC 2017

The file jni.h is stored twice in the repo, both in hotspot and in 
java.base. They are both identical, and only the java.base version is 
included in the final product.

This bug is a part of the umbrella effort JDK-8167078 "Duplicate header 
files in hotspot and jdk". As for JDK-8189607, my reasoning is that the 
java.base version is the one to keep. (In this case, there was actually 
a small difference between the two files -- the hotspot version first 
copyright year was 1997, but the java.base version was 1996. It makes 
sense to keep the oldest one.)

My assumption was that hotspot include files should be sorted according 
to the containing directory, and since jni.h no longer resides in 
"prims", I've rearranged the include line where needed.

The -I path added in CompileJvm.gmk is identical to the one in 
JDK-8189607, and will be merged to the same change (depending on which 
fix enters first.)

Bug: https://bugs.openjdk.java.net/browse/JDK-8189608
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8189608-remove-duplicated-jni/webrev.01

/Magnus