Fix file permissions - drop executable bit where not needed

(cherry picked from commit b31fbed)

Makefile

@@ -51,15 +51,15 @@ install:
 	install -D gui-daemon/qubes-guid $(DESTDIR)/usr/bin/qubes-guid
 	install -m 0644 -D gui-daemon/qubes-guid.1 $(DESTDIR)$(MANDIR)/man1/qubes-guid.1
 	install -D pulse/pacat-simple-vchan $(DESTDIR)/usr/bin/pacat-simple-vchan
-	install -D pulse/pacat-control-api.xml $(DESTDIR)/usr/share/dbus-1/interfaces/org.qubesos.Audio.xml
+	install -D -m 0644 pulse/pacat-control-api.xml $(DESTDIR)/usr/share/dbus-1/interfaces/org.qubesos.Audio.xml
 	install -D -m 0644 pulse/org.qubesos.Audio.conf $(DESTDIR)/etc/dbus-1/system.d/org.qubesos.Audio.conf
 	install -D shmoverride/X-wrapper-qubes $(DESTDIR)/usr/bin/X-wrapper-qubes
 	install -D shmoverride/shmoverride.so $(DESTDIR)$(LIBDIR)/shmoverride.so
-	install -D gui-daemon/guid.conf $(DESTDIR)/etc/qubes/guid.conf
+	install -D -m 0644 gui-daemon/guid.conf $(DESTDIR)/etc/qubes/guid.conf
 	install -D gui-daemon/qubes-localgroup.sh $(DESTDIR)/etc/X11/xinit/xinitrc.d/qubes-localgroup.sh
-	install -D gui-daemon/qubes.ClipboardPaste.policy $(DESTDIR)/etc/qubes-rpc/policy/qubes.ClipboardPaste
+	install -D -m 0644 gui-daemon/qubes.ClipboardPaste.policy $(DESTDIR)/etc/qubes-rpc/policy/qubes.ClipboardPaste
 	install -D screen-layout-handler/watch-screen-layout-changes $(DESTDIR)/usr/libexec/qubes/watch-screen-layout-changes
-	install -D screen-layout-handler/qubes-screen-layout-watches.desktop $(DESTDIR)/etc/xdg/autostart/qubes-screen-layout-watches.desktop
+	install -D -m 0644 screen-layout-handler/qubes-screen-layout-watches.desktop $(DESTDIR)/etc/xdg/autostart/qubes-screen-layout-watches.desktop
 	$(MAKE) -C window-icon-updater install
 
 tar: