PROTON-1396: restore the so version to 10 on master for 0.17.0.
PROTON-1396: restore the so version to 10 on master for 0.17.0.

Checking (thanks Andrew!) shows no ABI relevant change between 0.16.0 and now.

This reverts commit 2389a2179e39fd53912a3e28369b1b409d94c996 for PROTON-1374

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