make it work with newer autoconf


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1235 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/.cvsignore b/.cvsignore
index 3a1dd73..880a8cc 100644
--- a/.cvsignore
+++ b/.cvsignore
@@ -16,3 +16,4 @@
 include
 share
 cachegrind.out.*
+autom4te.cache