civetweb: use cmake

prometheus-cpp 1.0.0 depends on civetweb's cmake files being available:
    CMake Error at pull/CMakeLists.txt:11 (find_package):
      Could not find a package configuration file provided by "civetweb" with any
      of the following names:

        civetwebConfig.cmake
        civetweb-config.cmake

      Add the installation prefix of "civetweb" to CMAKE_PREFIX_PATH or set
      "civetweb_DIR" to a directory containing one of the above files.  If
      "civetweb" provides a separate development package or SDK, be sure it has
      been installed.

Cmake also properly handles setting the prefix, libdir, and includedir
paths, so that patch was dropped.

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