Ignore existing ChangeLog file and generate always [ci skip]

common.mk

@@ -1523,7 +1523,9 @@ update-man-date: PHONY
 	-e '$$_.sub!(/^(\.Dd ).*/){$$1+@vcs.modified(ARGF.path).strftime("%B %d, %Y")}' \
 	"$(srcdir)" "$(srcdir)"/man/*.1
 
+.PHONY: ChangeLog
 ChangeLog:
+	$(ECHO) Generating $@
 	-$(Q) $(BASERUBY) -I"$(srcdir)/tool/lib" -rvcs \
 	-e 'VCS.detect(ARGV[0]).export_changelog("@", nil, nil, ARGV[1])' \
 	"$(srcdir)" $@