Fix SF bug #1513032, 'make install' failure on FreeBSD 5.3.

No need to install lib-old, it's empty in 2.5.
diff --git a/Makefile.pre.in b/Makefile.pre.in
index 3cf3722..66ffbd0 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -703,7 +703,7 @@
 	plat-mac/lib-scriptpackages/SystemEvents \
 	plat-mac/lib-scriptpackages/Terminal
 PLATMACPATH=:plat-mac:plat-mac/lib-scriptpackages
-LIBSUBDIRS=	lib-old lib-tk site-packages test test/output test/data \
+LIBSUBDIRS=	lib-tk site-packages test test/output test/data \
 		test/decimaltestdata \
 		encodings compiler hotshot \
 		email email/mime email/test email/test/data \