Added (brief!) docs for Nulgrind.

Also fixed minor wibble tests/Makefile.am that was breaking 'make distcheck'.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1167 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/configure.in b/configure.in
index 97b6838..f34b3dd 100644
--- a/configure.in
+++ b/configure.in
@@ -316,6 +316,7 @@
    lackey/Makefile
    none/Makefile
    none/tests/Makefile
+   none/docs/Makefile
 ) 
 
 cat<<EOF