Make sure libarchive uses cmzlib and not the system libz if found.

CMakeLists.txt

@@ -271,6 +271,7 @@ MACRO (CMAKE_BUILD_UTILITIES)
     SET(HAVE_ZLIB_H 1)
     SET(ZLIB_INCLUDE_DIR ${CMAKE_ZLIB_INCLUDES})
     SET(ZLIB_LIBRARIES ${CMAKE_ZLIB_LIBRARIES})
+    SET(ZLIB_LIBRARY ${CMAKE_ZLIB_LIBRARIES})
     SET(BUILD_ARCHIVE_WITHIN_CMAKE TRUE)
     ADD_DEFINITIONS(-DLIBARCHIVE_STATIC)
     ADD_SUBDIRECTORY(Utilities/cmlibarchive)