Set PATH to use Xwayland wrapper

Xwayland wrapper (that preloads shmoverride) is needed for the GUI
daemon to work. Set PATH for the plasma-kwin_wayland service that is
responsible for starting Xwayland.
Unfortunately the systemd service files do not support variable
expansion in Environment= setting, so hardcode original PATH value
too.

QubesOS/qubes-issues#8515

Makefile

@@ -29,6 +29,8 @@ install:
 	install -D -m 0644 plasmoidsetupscripts/template.js $(DESTDIR)/usr/share/plasma/look-and-feel/org.fedoraproject.fedora.desktop/contents/plasmoidsetupscripts/org.kde.plasma.kicker.js.qubes
 	install -D -m 0644 plasmoidsetupscripts/template.js $(DESTDIR)/usr/share/plasma/look-and-feel/org.fedoraproject.fedora.desktop/contents/plasmoidsetupscripts/org.kde.plasma.kickerdash.js.qubes
 	install -D -m 0644 plasmoidsetupscripts/template.js $(DESTDIR)/usr/share/plasma/look-and-feel/org.fedoraproject.fedora.desktop/contents/plasmoidsetupscripts/org.kde.plasma.kickoff.js.qubes
+	install -D -m 0644 config/10-gui-daemon-shmoverride.conf \
+		$(DESTDIR)/usr/lib/systemd/user/plasma-kwin_wayland.service.d/10-gui-daemon-shmoverride.conf
 
 clean:
 	rm -rf debian/changelog.*

config/10-gui-daemon-shmoverride.conf

@@ -0,0 +1,3 @@
+# Adjust PATH to use Xwayland wrapper
+[Service]
+Environment=PATH=/usr/libexec/qubes/wrappers:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin

kde-settings-qubes.spec.in

@@ -87,6 +87,7 @@ Qubes colorful frames for Breeze plasma theme.
 %{_datadir}/kde-settings/kde-profile/default/share/config/klipperrc
 %{_datadir}/kde-settings/kde-profile/default/share/config/nepomukserverrc
 %{_datadir}/kde-settings/kde-profile/default/share/kde4/services/kcm_nepomuk.desktop
+/usr/lib/systemd/user/plasma-kwin_wayland.service.d/10-gui-daemon-shmoverride.conf
 
 %files -n plasma-breeze-qubes
 /usr/bin/qubes-generate-color-palette