PROTON-560: fix incorrect frame size calculation.

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1587214 13f79535-47bb-0310-9956-ffa450edef68
PROTON-554: candidate fix for long long support on older versions of swig

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1587715 13f79535-47bb-0310-9956-ffa450edef68