Remove config.log from CLEANFILES

Fixes bug 17924; bugfix on 0.2.4.1-alpha.

In ddf5020ea8d51, we added config.log to CLEANFILES in doc/Makefile.am
so that distcheck would be happy about the presence of doc/config.log.
But when we moved to nonrecursie makefiles in 2a4a1496241d6, we
accidentally left that filename unchanged, so that it referred to
config.log instead.

Patch from cypherpunks.

changes/bug17924

@@ -0,0 +1,4 @@
+  o Minor bugfixes (makefile):
+    - Remove config.log only from make distclean, not from 
+      make clean. Fixes bug 17924; bugfix on 0.2.4.1-alpha.
+

doc/include.am

@@ -90,5 +90,5 @@ doc/tor-gencert.1: doc/tor-gencert.1.in
 doc/tor-resolve.1: doc/tor-resolve.1.in
 doc/torify.1: doc/torify.1.in
 
-CLEANFILES+= $(asciidoc_product) config.log
+CLEANFILES+= $(asciidoc_product)
 DISTCLEANFILES+= $(html_in) $(man_in)