Find (optional) Expat library for linking with static APR-Util.
* CMakeLists.txt: Add option EXPAT.
* build/APRCommon.cmake (_apru_version): Also return the minor version.
* build/FindAPR.cmake: Adjust call to _apru_version.
* build/FindAPRUtil.cmake: Try to find the Expat library appropriate to
the discovered version of APR-Util.
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