Start working on a CMake-based build to eventually replace SCons.

* CMakeLists.txt,
  build/feature.cmake, build/version.cmake,
  build/FindApr.cmake, build/FindApu.cmake: New files.


git-svn-id: https://svn.apache.org/repos/asf/serf/trunk@1834217 13f79535-47bb-0310-9956-ffa450edef68
5 files changed