build: Fix distcheck errors

* doc/Makefile.am: Clean up the info files.  Ignore errors with DVI
  building, who cares.

* tests/Makefile.am: cleanup stuff to fix distcleancheck
diff --git a/doc/Makefile.am b/doc/Makefile.am
index e20940d..85af812 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -119,3 +119,9 @@
 
 draft-zebra-00.txt: draft-zebra-00.ms
 	groff -T ascii -ms $< > $@
+
+DISTCLEANFILES = quagga.info*
+
+# do nothing for DVI, so we don't have to generate or distribute EPS
+# figures
+dvi: # nothing