policycoreutils: Patch Makefile to get load_policy symlink right

Setting DESTDIR in the policycoreutils do_install creates a bad
symlink for load_policy. This patch fixes up the Makefile to
create the symlink relative to DESTDIR.

Signed-off-by: Philip Tricca <flihp@twobit.us>

--- a/load_policy/Makefile
+++ b/load_policy/Makefile
@@ -19,7 +19,7 @@ install: all
 	test -d $(MANDIR)/man8 || install -m 755 -d $(MANDIR)/man8
 	install -m 644 load_policy.8 $(MANDIR)/man8/
 	-mkdir -p $(USRSBINDIR)
-	-ln -sf $(SBINDIR)/load_policy $(USRSBINDIR)/load_policy 
+	-ln -sf $(subst $(DESTDIR),,$(SBINDIR))/load_policy $(USRSBINDIR)/load_policy 
 
 clean:
 	-rm -f $(TARGETS) *.o