Fix dist_clean and maintainer-clean to get more generated files.
diff --git a/Makefile.am b/Makefile.am
index 8657f82..bb73517 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -682,6 +682,7 @@
 # Deletes all the files generated by autogen.sh.
 MAINTAINERCLEANFILES =   \
   aclocal.m4             \
+  ar-lib                 \
   config.guess           \
   config.sub             \
   configure              \