fixed automake problem if /etc/backup.d already exists

ChangeLog

@@ -2,6 +2,8 @@ version 0.9.5 -- unreleased
     handler changes
 	sys:
 	 . Fixed typo breaking things for VServers.
+    fixed automake 'make install' bug that failed if /etc/backup.d already
+    existed
 
 version 0.9.4 -- October 6th, 2006
     backupninja changes

etc/Makefile.am

@@ -34,5 +34,5 @@ backupninja.conf: backupninja.conf.in
 	$(edit) backupninja.conf.in > backupninja.conf
 
 install-data-hook:
-	mkdir $(DESTDIR)/$(sysconfdir)/backup.d
+	mkdir -p $(DESTDIR)/$(sysconfdir)/backup.d
 	chmod 0770 $(DESTDIR)/$(sysconfdir)/backup.d