!6 Completing build dependencies

From: @hht8
Reviewed-by: @small_leek
Signed-off-by: @small_leek

python-tornado.spec

@@ -1,13 +1,13 @@
 Name:             python-tornado
 Version:          5.0.2
-Release:          6
+Release:          7
 Summary:          a Python web framework and asynchronous networking library
 License:          ASL 2.0
 URL:              http://www.tornadoweb.org
 Source0:          https://files.pythonhosted.org/packages/source/t/tornado/tornado-%{version}.tar.gz
 Patch0:           fix-erroneous-deprecation-warnings.patch
 
-BuildRequires:    python3-devel
+BuildRequires:    python3-devel gcc
 
 %description
 Tornado is a Python web framework and asynchronous networking library, originally
@@ -42,6 +42,9 @@ and other applications that require a long-lived connection to each user.
 %{python3_sitearch}/*
 
 %changelog
+* Mon May 31 2021 huanghaitao <huanghaitao8@huawei.com> - 5.0.2-7
+- Completing build dependencies
+
 * Fri Sep 11 2020 zhangjiapeng <zhangjiapeng9@huawei.com> - 5.0.2-6
 - Remove python2-tornado subpackage