CMake build: Find APR/Util runtime libraries (DLLs) on Windows and prepare
to do the same with other dependencies.

* CMakeLists.txt: Prepare for post-processing OpenSSL and ZLIB on Windows.
* build/FindAPR.cmake, build/FindAPRUtil.cmake: Find the DLLs if they are
   present in the APR/Util root directories.
* build/APRCommon.cmake (_apru_find_dll): New utility function.
* build/SerfWindowsToolkit.cmake: New file.


git-svn-id: https://svn.apache.org/repos/asf/serf/trunk@1834584 13f79535-47bb-0310-9956-ffa450edef68
5 files changed