NO-JIRA: [c] Fix link error in fuzz tests.
NO-JIRA: [c] Fix link error in fuzz tests.

Linking the URL fuzz test directly with util.c breaks as it now depends on
private symbols in the core library. Instead link with libqpid-proton which
includes everything required.

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