[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/m4/Makefile.am b/m4/Makefile.am
index 0d62897..49a29bd 100644
--- a/m4/Makefile.am
+++ b/m4/Makefile.am
@@ -1 +1 @@
-EXTRA_DIST= ChangeLog Makefile.am README.txt
+EXTRA_DIST=Makefile.am README.txt