struct.c: hide member names
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40270 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
struct.c: hide member names
(rb_struct_s_def): hide member names array.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40270 b2dd03c8-39d4-4d8f-98ff-823fe69b080e