JIMAGE_NOT_FOUND was defined in the hotspot jimage.hpp header but not in the jdk jimage.hpp header. Brought the headers in line.
http://cr.openjdk.java.net/~jlaskey/8147426/webrev/index.html <http://cr.openjdk.java.net/~jlaskey/8147426/webrev/index.html> https://bugs.openjdk.java.net/browse/JDK-8147426 <https://bugs.openjdk.java.net/browse/JDK-8147426>