include control-spec.txt in the tarball

svn:r2826

doc/Makefile.am

@@ -1,4 +1,4 @@
-EXTRA_DIST = tor-spec.txt CLIENTS FAQ HACKING rend-spec.txt tor-doc.html tor-doc.css tor-resolve.1
+EXTRA_DIST = tor-spec.txt CLIENTS FAQ HACKING rend-spec.txt control-spec.txt tor-doc.html tor-doc.css tor-resolve.1
 
 man_MANS = tor.1 tor-resolve.1