Remove unnecessary configuration macros; ref
The following macros will be removed:
`ENSURE_STACK_INIT_SIZE`
`RESCUE_STACK_INIT_SIZE`
`MRB_ECALL_DEPTH_MAX`
@@ -39,14 +39,6 @@ void abort(void);
#define STACK_INIT_SIZE 128
#define CALLINFO_INIT_SIZE 32
-#ifndef ENSURE_STACK_INIT_SIZE
-#define ENSURE_STACK_INIT_SIZE 16
-#endif
-
-#ifndef RESCUE_STACK_INIT_SIZE
-#define RESCUE_STACK_INIT_SIZE 16
-#endif
-
/* Define amount of linear stack growth. */
#ifndef MRB_STACK_GROWTH
#define MRB_STACK_GROWTH 128
@@ -57,11 +49,6 @@ void abort(void);
#define MRB_FUNCALL_DEPTH_MAX 512
#endif
-/* Maximum depth of ecall() recursion. */
-#ifndef MRB_ECALL_DEPTH_MAX
-#define MRB_ECALL_DEPTH_MAX 512
-#endif
-
/* Maximum stack depth. Should be set lower on memory constrained systems.
The value below allows about 60000 recursive calls in the simplest case. */
#ifndef MRB_STACK_MAX
