build: improve LIBADD declarations

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.8@10410 ddefafc4-47db-0310-ae44-fa13212b10f2
build: remove badly placed commas in configure.ac

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.8@10411 ddefafc4-47db-0310-ae44-fa13212b10f2