numeric.c: remove duplicated definitions;
Following functions are defined in `mrblib/numeric.c`:
`Integer#ceil`
`Integer#floor`
`Integer#round`
`Integer#truncate`
MODIFY
src/numeric.c
src/numeric.c
@@ -1765,12 +1765,6 @@ mrb_init_numeric(mrb_state *mrb)
mrb_define_method(mrb, integer, "to_i", int_to_i, MRB_ARGS_NONE()); /* 15.2.8.3.24 */
mrb_define_method(mrb, integer, "to_int", int_to_i, MRB_ARGS_NONE());
-#ifndef MRB_NO_FLOAT
- mrb_define_method(mrb, integer, "ceil", int_to_i, MRB_ARGS_NONE()); /* 15.2.8.3.14 */
- mrb_define_method(mrb, integer, "floor", int_to_i, MRB_ARGS_NONE()); /* 15.2.8.3.17 */
- mrb_define_method(mrb, integer, "round", int_to_i, MRB_ARGS_NONE()); /* 15.2.8.3.20 */
- mrb_define_method(mrb, integer, "truncate", int_to_i, MRB_ARGS_NONE()); /* 15.2.8.3.26 */
-#endif
mrb_define_method(mrb, integer, "+", int_add, MRB_ARGS_REQ(1)); /* 15.2.8.3.1 */
mrb_define_method(mrb, integer, "-", int_sub, MRB_ARGS_REQ(1)); /* 15.2.8.3.2 */

numeric.c: remove duplicated definitions; #5421

Following functions are defined in `mrblib/numeric.c`:

- `Integer#ceil`
- `Integer#floor`
- `Integer#round`
- `Integer#truncate`