* ext/etc/etc.c (Init_etc): omit 'passwd' from definition of Etc::Passwd
  if HAVE_STRUCT_PASSWD_PW_PASSWD is not defined to prevent mismatch of
  fields and values in setup_passwd

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41562 b2dd03c8-39d4-4d8f-98ff-823fe69b080e