mruby.h: remove allocf and allocf_ud from mrb_state

This is preparation for memory allocation restructuring.

include/mruby.h

@@ -256,9 +256,6 @@ typedef void (*mrb_atexit_func)(struct mrb_state*);
 typedef struct mrb_state {
   struct mrb_jmpbuf *jmp;
 
-  mrb_allocf allocf;                      /* memory allocation function */
-  void *allocf_ud;                        /* auxiliary data of allocf */
-
   struct mrb_context *c;
   struct mrb_context *root_c;
   struct iv_tbl *globals;                 /* global variable table */

src/gc.c

@@ -194,10 +194,10 @@ mrb_realloc_simple(mrb_state *mrb, void *p,  size_t len)
     mrb_full_gc(mrb);
   }
 #endif
-  p2 = (mrb->allocf)(mrb, p, len, mrb->allocf_ud);
+  p2 = mrb_default_allocf(mrb, p, len, NULL);
   if (!p2 && len > 0 && mrb->gc.heaps && mrb->gc.state != MRB_GC_STATE_SWEEP) {
     mrb_full_gc(mrb);
-    p2 = (mrb->allocf)(mrb, p, len, mrb->allocf_ud);
+    p2 = mrb_default_allocf(mrb, p, len, NULL);
   }
 
   return p2;
@@ -256,7 +256,7 @@ mrb_calloc(mrb_state *mrb, size_t nelem, size_t len)
 MRB_API void
 mrb_free(mrb_state *mrb, void *p)
 {
-  (mrb->allocf)(mrb, p, 0, mrb->allocf_ud);
+  mrb_default_allocf(mrb, p, 0, NULL);
 }
 
 MRB_API void*

src/state.c

@@ -46,8 +46,6 @@ mrb_open_core(mrb_allocf f, void *ud)
   if (mrb == NULL) return NULL;
 
   *mrb = mrb_state_zero;
-  mrb->allocf_ud = ud;
-  mrb->allocf = f;
   mrb->atexit_stack_len = 0;
 
   if (mrb_core_init_protect(mrb, init_gc_and_core, NULL)) {