use the legacy zlib version string

Author: dbarker

CMakeLists.txt

@@ -28,7 +28,7 @@ set(CMAKE_FIND_PACKAGE_PREFER_CONFIG TRUE)
 if(NOT DEFINED CMAKE_TOOLCHAIN_FILE)
   list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules/")
 endif()
-
+  
 if(EXISTS "${CMAKE_SOURCE_DIR}/third_party_release")
   file(STRINGS "${CMAKE_SOURCE_DIR}/third_party_release" third_party_tags)
   foreach(third_party ${third_party_tags})
@@ -779,7 +779,7 @@ if(CURL_FOUND)
   message(STATUS "CURL: ${CURL_VERSION_STRING}")
 endif()
 if(ZLIB_FOUND)
-  message(STATUS "ZLIB: ${ZLIB_VERSION}")
+  message(STATUS "ZLIB: ${ZLIB_VERSION_STRING}")
 endif()
 if(USE_NLOHMANN_JSON)
   message(STATUS "nlohmann-json: ${nlohmann_json_VERSION}")