install distutils.tests on Unix (contributed patch)

(closes SF bug #1093173)

Makefile.pre.in

@@ -664,7 +664,8 @@ LIBSUBDIRS=	lib-old lib-tk site-packages test test/output test/data \
 		test/decimaltestdata \
 		encodings email email/test email/test/data compiler hotshot \
 		logging bsddb bsddb/test csv idlelib idlelib/Icons \
-		distutils distutils/command $(XMLLIBSUBDIRS) curses $(MACHDEPS)
+		distutils distutils/command distutils/tests $(XMLLIBSUBDIRS) \
+		curses $(MACHDEPS)
 libinstall:	$(BUILDPYTHON) $(srcdir)/Lib/$(PLATDIR)
 	@for i in $(SCRIPTDIR) $(LIBDEST); \
 	do \