Merged update from upstream sources

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Source: https://src.fedoraproject.org/rpms/Cython.git#9a9bbcd568ced1f6d655311fb34784eb9ee6e159

Cython.spec

@@ -6,7 +6,7 @@
 Name:           Cython
 Version:        0.29.21
 %global upver %{version_no_tilde %{nil}}
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        Language for writing Python extension modules
 
 License:        ASL 2.0
@@ -117,6 +117,9 @@ cp -p cython-mode-init.el cython-mode-init.elc %{buildroot}%{_emacs_sitestartdir
 %{_emacs_sitestartdir}/cython*.el*
 
 %changelog
+* Mon Jan 25 2021 Fedora Release Engineering <releng@fedoraproject.org> - 0.29.21-5
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild
+
 * Fri Nov 13 2020 Miro Hrončok <mhroncok@redhat.com> - 0.29.21-4
 - Drop build dependency on coverage