[trivia] Make 'make dist' happy about ChangeLog expunge

	* ChangeLog: Add back a dummy, top-level ChangeLog
	* m4/Makefile.am: remove ChangeLog from EXTRA_DIST, why it was
	  listed there, who knows.
diff --git a/ChangeLog b/ChangeLog
new file mode 100644
index 0000000..2ed5061
--- /dev/null
+++ b/ChangeLog
@@ -0,0 +1,4 @@
+ChangeLog information for Quagga is now recorded in our source-code
+management system. Please see:
+
+	http://www.quagga.net/devel.php