Update the package list whenever we build distfiles.
This is used on www.python.org.
diff --git a/Doc/Makefile b/Doc/Makefile
index fe188a4..6ac0b07 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -656,6 +656,7 @@
 
 distfiles:	paperdist edist
 	$(TOOLSDIR)/mksourcepkg --all $(RELEASE)
+	$(TOOLSDIR)/mkpkglist >pkglist.html
 
 
 # Housekeeping targets