Recommend rather than require mesa-dri-drivers

This still pulls in mesa-dri-drivers by default in actual installs, but
at the same time avoids pulling it in to build roots in koji.

clutter.spec

@@ -10,7 +10,7 @@
 
 Name:          clutter
 Version:       1.26.4
-Release:       4%{?dist}
+Release:       5%{?dist}
 Summary:       Open Source software library for creating rich graphical user interfaces
 
 License:       LGPLv2+
@@ -47,7 +47,8 @@ Requires:      glib2%{?_isa} >= %{glib2_version}
 Requires:      gobject-introspection
 Requires:      json-glib%{?_isa} >= %{json_glib_version}
 Requires:      libinput%{?_isa} >= %{libinput_version}
-Requires:      mesa-dri-drivers%{?_isa}
+
+Recommends:    mesa-dri-drivers%{?_isa}
 
 %description
 Clutter is an open source software library for creating fast,
@@ -145,6 +146,9 @@ find %{buildroot} -name '*.la' -delete
 %endif
 
 %changelog
+* Tue Apr 13 2021 Kalev Lember <klember@redhat.com> - 1.26.4-5
+- Recommend rather than require mesa-dri-drivers
+
 * Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 1.26.4-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild