More CMake build.

* CMakeLists.txt: Add install rules for all targets and serf.pc.

* build/FindAPR.cmake, build/FindAPRUtil.cmake: Do *not* remove the
   leading '-l' from the EXTRALIBS, these are needed to correctly format
   the private libraries in the pkg-config module.


git-svn-id: https://svn.apache.org/repos/asf/serf/trunk@1834408 13f79535-47bb-0310-9956-ffa450edef68
3 files changed