cmake: Prevent re-definition of APR and Serf targets by using different
prefixes for version '1' and '2'.

* CMakeLists.txt
  (APR, Serf): Bunch of cmake magic.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1926350 13f79535-47bb-0310-9956-ffa450edef68
1 file changed