Fix typos in the generated ChangeLog.

* ChangeLog.amend: New file.
* Makefile.am: Apply corrections from ChangeLog.amend when
generating ChangeLog file.

+# Spelling corrections for GNU Mailutils ChangeLog
+
+e02df56cb384465b3238c46c6f214f27ee8431ab
+s/command on 64 boxes/command on 64-bit boxes/
+
+bec7b95e67fa1adcff64372ec05253ca7ed9b54e
+s/Ninor/Minor/
+
+e6ae2852edb142fcf84dc489715f8984843dfe0c
+s/ificated/indicated/
+
+f9a486e8ff07e3f35e250d366e748c7f5e712c13
+s/adresses/addresses/
+
+fb53814d3acb7a08cd849ffbbdbe86d8a374590c
+s/prever/prefer/

@@ -129,11 +129,15 @@ DISTCLEANFILES = pathdefs.h git-describe.h
 
 gen_start_date = "2008-12-08"
 prev_change_log = "doc/ChangeLog.CVS"
+amend_file=ChangeLog.amend
 
 .PHONY: ChangeLog
 ChangeLog:
 	@if test -d .git; then                                             \
-	  cmd=$(top_srcdir)/build-aux/gitlog-to-changelog;                 \
+	  cmd="$(top_srcdir)/build-aux/gitlog-to-changelog";               \
+	  if test -n "$(amend_file)"; then                                 \
+            cmd="$$cmd --amend=$(amend_file)";                             \
+          fi;                                                              \
 	  if test -n "$(gen_start_date)"; then                             \
 	    cmd="$$cmd --since=\"$(gen_start_date)\"";                     \
 	  fi;                                                              \