fix building on FreeBSD without --with-file-aio

src/http/ngx_http_copy_filter_module.c

diff --git a/src/http/ngx_http_copy_filter_module.c b/src/http/ngx_http_copy_filter_module.c
index f3d0f11..4aefd8d 100644
--- a/src/http/ngx_http_copy_filter_module.c
+++ b/src/http/ngx_http_copy_filter_module.c
@@ -145,7 +145,7 @@
     ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
                    "http copy filter: %i \"%V?%V\"", rc, &r->uri, &r->args);
 
-#if (NGX_HAVE_AIO_SENDFILE)
+#if (NGX_HAVE_FILE_AIO && NGX_HAVE_AIO_SENDFILE)
 
     if (c->busy_sendfile) {
         off_t                  offset;