whose value's is byte.
* ext/socket/option.c (sockopt_byte): getter for above.
* ext/socket/option.c (inspect_byte): inspect for above.
* ext/socket/option.c (sockopt_s_ip_multicast_loop): constructor of
the sockopt whose optname is IP_MULTICAST_LOOP.
* ext/socket/option.c (sockopt_ip_multicast_loop): getter for above.
* ext/socket/option.c (sockopt_s_ip_multicast_ttl): constructor of
the sockopt whose optname is IP_MULTICAST_TTL.
* ext/socket/option.c (sockopt_ip_multicast_ttl): getter for above.
* ext/socket/option.c (sockopt_inspect): use above.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41009 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
