PROTON-1703: [cpp] deprecated macro for receiver::auto_settle
PROTON-1703: [cpp] deprecated macro for receiver::auto_settle

Was deprecated in comment only, added deprecation warning macro.

ChugR/qpid-proton,alanconway/qpid-proton,gemmellr/qpid-proton,astitcher/qpid-proton,kgiusti/qpid-proton,alanconway/qpid-proton,kgiusti/qpid-proton,kgiusti/qpid-proton,astitcher/qpid-proton,ChugR/qpid-proton,ssorj/qpid-proton,ChugR/qpid-proton,astitcher/qpid-proton,ChugR/qpid-proton,astitcher/qpid-proton,alanconway/qpid-proton,ssorj/qpid-proton,alanconway/qpid-proton,astitcher/qpid-proton,gemmellr/qpid-proton,astitcher/qpid-proton,gemmellr/qpid-proton,apache/qpid-proton,ssorj/qpid-proton,apache/qpid-proton,alanconway/qpid-proton,ssorj/qpid-proton,kgiusti/qpid-proton,gemmellr/qpid-proton,gemmellr/qpid-proton,alanconway/qpid-proton,kgiusti/qpid-proton,ChugR/qpid-proton,ssorj/qpid-proton,apache/qpid-proton,apache/qpid-proton,apache/qpid-proton,gemmellr/qpid-proton,ChugR/qpid-proton,ssorj/qpid-proton,apache/qpid-proton,kgiusti/qpid-proton