Remove obsolete `MRB_WITHOUT_FLOAT` macro from `numeric.c`.
MODIFY
src/numeric.c
src/numeric.c
@@ -1699,7 +1699,7 @@ mrb_init_numeric(mrb_state *mrb)
mrb_define_method(mrb, integer, "<<", int_lshift, MRB_ARGS_REQ(1)); /* 15.2.8.3.12 */
mrb_define_method(mrb, integer, ">>", int_rshift, MRB_ARGS_REQ(1)); /* 15.2.8.3.13 */
mrb_define_method(mrb, integer, "eql?", int_eql, MRB_ARGS_REQ(1)); /* 15.2.8.3.16 */
-#ifndef MRB_WITHOUT_FLOAT
+#ifndef MRB_NO_FLOAT
mrb_define_method(mrb, integer, "to_f", int_to_f, MRB_ARGS_NONE()); /* 15.2.8.3.23 */
#endif
mrb_define_method(mrb, integer, "to_s", int_to_s, MRB_ARGS_OPT(1)); /* 15.2.8.3.25 */

Remove obsolete `MRB_WITHOUT_FLOAT` macro from `numeric.c`.