Remove UV_ARES_TASK_PRIVATE_FIELDS.

It's only used internally, it doesn't have to be part of a public header file.

include/uv-private/uv-unix.h

@@ -182,11 +182,6 @@ typedef void* uv_lib_t;
   ev_timer timer_watcher; \
   uv_timer_cb timer_cb;
 
-#define UV_ARES_TASK_PRIVATE_FIELDS \
-  int sock; \
-  ev_io read_watcher; \
-  ev_io write_watcher;
-
 #define UV_GETADDRINFO_PRIVATE_FIELDS \
   uv_getaddrinfo_cb cb; \
   struct addrinfo* hints; \

include/uv-private/uv-win.h

@@ -390,13 +390,6 @@ RB_HEAD(uv_timer_tree_s, uv_timer_s);
   uv_handle_t* endgame_next;              \
   unsigned int flags;
 
-#define UV_ARES_TASK_PRIVATE_FIELDS       \
-  struct uv_req_s ares_req;               \
-  SOCKET sock;                            \
-  HANDLE h_wait;                          \
-  WSAEVENT h_event;                       \
-  HANDLE h_close_event;
-
 #define UV_GETADDRINFO_PRIVATE_FIELDS     \
   struct uv_req_s getadddrinfo_req;       \
   uv_getaddrinfo_cb getaddrinfo_cb;       \

src/uv-common.h

@@ -35,7 +35,17 @@
 
 struct uv_ares_task_s {
   UV_HANDLE_FIELDS
-  UV_ARES_TASK_PRIVATE_FIELDS
+#if _WIN32
+  struct uv_req_s ares_req;
+  SOCKET sock;
+  HANDLE h_wait;
+  WSAEVENT h_event;
+  HANDLE h_close_event;
+#else
+  int sock;
+  ev_io read_watcher;
+  ev_io write_watcher;
+#endif
   RB_ENTRY(uv_ares_task_s) node;
 };