socket/option.c: use rb_w32_inet_ntop
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48709 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
socket/option.c: use rb_w32_inet_ntop
always available on Windows.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48709 b2dd03c8-39d4-4d8f-98ff-823fe69b080e