internal.h: aggregate prototypes to internal.h.

- mrb_f_send()
- mrb_ci_nregs()

src/class.c

@@ -2963,9 +2963,6 @@ init_class_new(mrb_state *mrb, struct RClass *cls)
   mrb_define_method_raw(mrb, cls, MRB_SYM(new), m);
 }
 
-/* implementation of #send method */
-mrb_value mrb_f_send(mrb_state *mrb, mrb_value self);
-
 void
 mrb_init_class(mrb_state *mrb)
 {

src/gc.c

@@ -612,8 +612,6 @@ add_gray_list(mrb_state *mrb, mrb_gc *gc, struct RBasic *obj)
   gc->gray_list = obj;
 }
 
-mrb_int mrb_ci_nregs(mrb_callinfo *ci);
-
 static void
 mark_context_stack(mrb_state *mrb, struct mrb_context *c)
 {

src/state.c

@@ -187,7 +187,7 @@ mrb_free_context(mrb_state *mrb, struct mrb_context *c)
 
 void mrb_protect_atexit(mrb_state *mrb);
 
-  MRB_API void
+MRB_API void
 mrb_close(mrb_state *mrb)
 {
   if (!mrb) return;