Unify SUPPORT_JOKE and OPT_SUPPORT_JOKE

for simplicity and consistency.

Now SUPPORT_JOKE needs to be prefixed with OPT_ to make the config
visible in `RubyVM::VmOptsH`, and the inconsistency was introduced.

As it has never been available for override in configure (no #ifndef
guard), it should be fine to rename the config.

compile.c

@@ -732,7 +732,7 @@ rb_iseq_compile_node(rb_iseq_t *iseq, const NODE *node)
 	ADD_INSN(ret, ISEQ_COMPILE_DATA(iseq)->last_line, leave);
     }
 
-#if SUPPORT_JOKE
+#if OPT_SUPPORT_JOKE
     if (ISEQ_COMPILE_DATA(iseq)->labels_table) {
 	st_table *labels_table = ISEQ_COMPILE_DATA(iseq)->labels_table;
 	ISEQ_COMPILE_DATA(iseq)->labels_table = 0;
@@ -6570,7 +6570,7 @@ compile_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, in
 
     INIT_ANCHOR(recv);
     INIT_ANCHOR(args);
-#if SUPPORT_JOKE
+#if OPT_SUPPORT_JOKE
     if (nd_type(node) == NODE_VCALL) {
         ID id_bitblt;
         ID id_answer;

eval.c

@@ -478,7 +478,7 @@ static VALUE get_ec_errinfo(const rb_execution_context_t *ec);
 static VALUE
 exc_setup_cause(VALUE exc, VALUE cause)
 {
-#if SUPPORT_JOKE
+#if OPT_SUPPORT_JOKE
     if (NIL_P(cause)) {
 	ID id_true_cause;
 	CONST_ID(id_true_cause, "true_cause");

iseq.h

@@ -109,7 +109,7 @@ struct iseq_compile_data {
     unsigned int ci_kw_index;
     const rb_compile_option_t *option;
     struct rb_id_table *ivar_cache_table;
-#if SUPPORT_JOKE
+#if OPT_SUPPORT_JOKE
     st_table *labels_table;
 #endif
 };

vm_opts.h

@@ -62,7 +62,6 @@
 
 /* misc */
 #define OPT_SUPPORT_JOKE             0
-#define SUPPORT_JOKE OPT_SUPPORT_JOKE
 
 #ifndef VM_COLLECT_USAGE_DETAILS
 #define VM_COLLECT_USAGE_DETAILS     0