* include/ruby/backward.h (ruby_show_copyright_to_die): for source
  code backward compatibility.
* ruby.c (process_options): return Qtrue to exit the process
  successfully.
* version.c (ruby_show_copyright): no longer exit.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53446 b2dd03c8-39d4-4d8f-98ff-823fe69b080e