* ext/etc/etc.c (setup_passwd): pass 0 as VALUE to rb_struct_new to
  prevent segfault if the compiler passes it as a 32 bit integer on
  a 64 bit ruby

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41560 b2dd03c8-39d4-4d8f-98ff-823fe69b080e