Back out single-object-prelink for iOS libraries
Back out single-object-prelink for iOS libraries

Good news: this will get rid of the 100+ link warnings when building an
  iOS app using Couchbase Lite.
Bad news: It reopens #413, the problem that internal symbols are exposed
  in the library, which can cause duplicate-symbol errors when building
  an app using libraries (like yajl) that CBL also uses.
Fixes #460

pegli/couchbase-lite-ios,ipmobiletech/couchbase-lite-ios,lordkev/couchbase-lite-ios,pegli/couchbase-lite-ios,couchbase/couchbase-lite-ios,alfared/couchbase-lite-ios,Chavenay/couchbase-lite-ios,amco/couchbase-lite-ios,macoscope/couchbase-lite-ios,pegli/couchbase-lite-ios,tomco/couchbase-lite-ios,Chavenay/couchbase-lite-ios,alfared/couchbase-lite-ios,amco/couchbase-lite-ios,brendand/couchbase-lite-ios,pellekrogholt/couchbase-lite-ios,lordkev/couchbase-lite-ios,couchbase/couchbase-lite-ios,tomco/couchbase-lite-ios,pellekrogholt/couchbase-lite-ios,tomco/couchbase-lite-ios,amco/couchbase-lite-ios,lordkev/couchbase-lite-ios,macoscope/couchbase-lite-ios,brendand/couchbase-lite-ios,gotmyjobs/couchbase-lite-ios,brendand/couchbase-lite-ios,amco/couchbase-lite-ios,couchbase/couchbase-lite-ios,pellekrogholt/couchbase-lite-ios,brendand/couchbase-lite-ios,ipmobiletech/couchbase-lite-ios,gotmyjobs/couchbase-lite-ios,tomco/couchbase-lite-ios,ipmobiletech/couchbase-lite-ios,pellekrogholt/couchbase-lite-ios,alfared/couchbase-lite-ios,Chavenay/couchbase-lite-ios,alfared/couchbase-lite-ios,amco/couchbase-lite-ios,ipmobiletech/couchbase-lite-ios,amco/couchbase-lite-ios,amco/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,lordkev/couchbase-lite-ios,macoscope/couchbase-lite-ios,couchbase/couchbase-lite-ios,pegli/couchbase-lite-ios,gotmyjobs/couchbase-lite-ios,brendand/couchbase-lite-ios,macoscope/couchbase-lite-ios,gotmyjobs/couchbase-lite-ios