Fixed building by Clang.

src/nxt_application.h

@@ -100,7 +100,7 @@ typedef struct {
 } nxt_app_request_t;
 
 
-typedef struct nxt_app_parse_ctx_s nxt_app_parse_ctx_t;
+//typedef struct nxt_app_parse_ctx_s nxt_app_parse_ctx_t;
 
 struct nxt_app_parse_ctx_s {
     nxt_app_request_t         r;

src/nxt_work_queue.h

@@ -32,7 +32,7 @@ struct nxt_task_s {
  * source filters, so the data argument has been introduced and
  * is used where appropriate.
  */
-typedef void (*nxt_work_handler_t)(nxt_task_t *task, void *obj, void *data);
+//typedef void (*nxt_work_handler_t)(nxt_task_t *task, void *obj, void *data);
 
 
 struct nxt_work_s {