node.h: remove unused macro nd_compile_option

Follow up of r61610

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63973 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

node.h

@@ -361,8 +361,6 @@ typedef struct RNode {
 #define nd_orig   u2.id
 #define nd_undef  u2.node
 
-#define nd_compile_option  u3.value
-
 #define NEW_NODE(t,a0,a1,a2,loc) rb_node_newnode((t),(VALUE)(a0),(VALUE)(a1),(VALUE)(a2),loc)
 
 #define NEW_DEFN(i,a,d,loc) NEW_NODE(NODE_DEFN,0,i,NEW_SCOPE(a,d,loc),loc)