NO-JIRA: Changes to proton-c JNI layer to comply with new proton-api resulting from
merge from trunk by last commit (rev 1430167).

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/branches/jni-binding@1430188 13f79535-47bb-0310-9956-ffa450edef68