Remove autom4te.cache to avoid problems with newer auto* tools.
diff --git a/update-autotools b/update-autotools
index 1eaeb39..4c6be2f 100755
--- a/update-autotools
+++ b/update-autotools
@@ -3,11 +3,8 @@
# When local system does not have the latest autoconf/automake
# -- Kunihiro Ishiguro <kunihiro@zebra.org>
#
-rm -f config.cache
-rm -f Makefile.in
-rm -f aclocal.m4
-rm -f config.h.in
-rm -f configure
+rm -f config.cache Makefile.in aclocal.m4 config.h.in
+rm -f autom4te.cache configure
aclocal
autoheader
autoconf