update template

templates/CMakeLists.txt.template

@@ -179,7 +179,8 @@
     if(NOT CARES_ROOT_DIR)
       set(CARES_ROOT_DIR <%text>${CMAKE_CURRENT_SOURCE_DIR}</%text>/third_party/cares/cares)
     endif()
-    set(CARES_STATIC ON)
+    set(CARES_SHARED OFF CACHE BOOL "disable shared library")
+    set(CARES_STATIC ON CACHE BOOL "link cares statically")
     set(CARES_INCLUDE_DIR "<%text>${CMAKE_CURRENT_SOURCE_DIR}</%text>/third_party/cares/cares")
     add_subdirectory(third_party/cares/cares)
     if(TARGET c-ares)