don't delete it too early


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1444 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/Makefile.am b/Makefile.am
index df2e57e..8db865d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -19,7 +19,7 @@
 
 BUILT_SOURCES = default.supp
 
-CLEANFILES = default.supp
+DISTCLEANFILES = default.supp
 
 default.supp: $(SUPP_FILES)