Removed the obsolete aio module.

src/core/ngx_connection.c

diff --git a/src/core/ngx_connection.c b/src/core/ngx_connection.c
index 9f8fbc3..025fbeb 100644
--- a/src/core/ngx_connection.c
+++ b/src/core/ngx_connection.c
@@ -389,7 +389,7 @@
 #endif
             /* TODO: close on exit */
 
-            if (!(ngx_event_flags & NGX_USE_AIO_EVENT)) {
+            if (!(ngx_event_flags & NGX_USE_IOCP_EVENT)) {
                 if (ngx_nonblocking(s) == -1) {
                     ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                                   ngx_nonblocking_n " %V failed",

src/core/ngx_resolver.c

diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index 4e9c85d..d863b4c 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -3092,7 +3092,7 @@
 
     rc = connect(s, uc->sockaddr, uc->socklen);
 
-    /* TODO: aio, iocp */
+    /* TODO: iocp */
 
     if (rc == -1) {
         ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno,