Updates Z3 to the latest version from the

codeplex opt branch, removes libfoci version
(vanilla z3 can do interpolants now),
merges two z3 shared objects.

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@13810 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c