Recommend gnome-session-xsession rather than hard-require it

This makes it possible to avoid installing gnome-session-xsession, which
in turn pulls in xorg-x11-server-Xorg. It's still going to be pulled in
to the default install as Recommends are installed by default.

The motivation for changing this is that there are some arm devices that
only work with Wayland and where Xorg is unsupported, as requested by
pbrobinson.

gnome-shell.spec

@@ -1,6 +1,6 @@
 Name:           gnome-shell
 Version:        40.0~beta
-Release:        3.20210304git7a57528bd%{?dist}
+Release:        4.20210304git7a57528bd%{?dist}
 Summary:        Window management and application launching for GNOME
 
 License:        GPLv2+
@@ -76,7 +76,7 @@ Requires:       gnome-bluetooth%{?_isa} >= %{gnome_bluetooth_version}
 Requires:       gnome-desktop3%{?_isa} >= %{gnome_desktop_version}
 %if 0%{?rhel} != 7
 # Disabled on RHEL 7 to allow logging into KDE session by default
-Requires:       gnome-session-xsession
+Recommends:     gnome-session-xsession
 %endif
 # wrapper script uses to restart old GNOME session if run --replace
 # from the command line
@@ -226,6 +226,9 @@ desktop-file-validate %{buildroot}%{_datadir}/applications/evolution-calendar.de
 %{_mandir}/man1/gnome-shell.1*
 
 %changelog
+* Thu Mar 11 2021 Kalev Lember <klember@redhat.com> - 40.0~beta-4.20210304git7a57528bd
+- Recommend gnome-session-xsession rather than hard-require it
+
 * Mon Mar 08 2021 Florian Müllner <fmuellner@redhat.com> - 40.0~beta-3.20210304git40.7a57528bd
 - Fix crash after launching apps via drag-and-drop