remove zlib from third_party, find it by cmake find_package()

autotest/CMakeLists.txt

@@ -6,36 +6,18 @@ set(AT_SRCS
     main.cc
     )
 
-set(AT_TARGET_NAME webcc_autotest)
-
 # Common libraries to link.
 set(AT_LIBS
     webcc
-    ${Boost_LIBRARIES}
     jsoncpp
-    GTest::GTest
-    "${CMAKE_THREAD_LIBS_INIT}")
-
-if(WEBCC_ENABLE_SSL)
-    set(AT_LIBS ${AT_LIBS} ${OPENSSL_LIBRARIES})
-
-    if(WIN32)
-        set(AT_LIBS ${AT_LIBS} crypt32)
-    endif()
-endif()
-
-if(WEBCC_ENABLE_GZIP)
-    if(WIN32)
-        set(AT_LIBS ${AT_LIBS} zlibstatic)
-    else()
-        set(AT_LIBS ${AT_LIBS} ${ZLIB_LIBRARIES})
-    endif()
-endif()
+    GTest::GTest)
 
 if(UNIX)
     # Add `-ldl` for Linux to avoid "undefined reference to `dlopen'".
     set(AT_LIBS ${AT_LIBS} ${CMAKE_DL_LIBS})
 endif()
 
+set(AT_TARGET_NAME webcc_autotest)
+
 add_executable(${AT_TARGET_NAME} ${AT_SRCS})
 target_link_libraries(${AT_TARGET_NAME} ${AT_LIBS})