Partially unbreak 'make distcheck'.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2307 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/Makefile.am b/coregrind/Makefile.am
index 0797792..bed2567 100644
--- a/coregrind/Makefile.am
+++ b/coregrind/Makefile.am
@@ -1,5 +1,5 @@
 
-SUBDIRS = x86 demangle . docs
+SUBDIRS = arch x86 demangle . docs
 
 add_includes = -I$(srcdir)/demangle -I$(top_srcdir)/include -I$(srcdir)/x86