Fix unpack specs with j option on big-endian systems
Fix unpack specs with j option on big-endian systems

ruby/spec,eregon/rubyspec,sgarciac/spec,eregon/rubyspec,nobu/rubyspec,ruby/spec,ruby/spec,kachick/rubyspec,nobu/rubyspec,kachick/rubyspec,sgarciac/spec,nobu/rubyspec,sgarciac/spec,ruby/rubyspec,eregon/rubyspec,ruby/rubyspec,kachick/rubyspec