Only install liveinst symlink on supported arches

The symlink to consolehelper from /usr/bin/liveinst should only be done
on arches with liveinst support, otherwise you will get an error when
trying to build:

error: Installed (but unpackaged) file(s) found:
   /usr/bin/liveinst

Related: rhbz#1121678
(cherry picked from commit 57832f7)

Related: rhbz#1196721

data/liveinst/Makefile.am

@@ -31,6 +31,9 @@ dist_xinit_SCRIPTS = zz-liveinst.sh
 install-exec-local:
 	$(MKDIR_P) $(DESTDIR)$(bindir)
 	$(LN_S) consolehelper $(DESTDIR)$(bindir)/liveinst
+
+uninstall-local:
+	rm -f $(DESTDIR)$(bindir)/liveinst
 endif
 
 EXTRA_DIST = README liveinst.desktop.in