Silence warnings caused by implicit type casting.

mrbgems/mruby-string-ext/src/string.c

@@ -367,7 +367,7 @@ mrb_str_succ_bang(mrb_state *mrb, mrb_value self)
   unsigned char *p, *e, *b, *t;
   const char *prepend;
   struct RString *s = mrb_str_ptr(self);
-  size_t l;
+  mrb_int l;
 
   if (RSTRING_LEN(self) == 0)
     return self;

src/array.c

@@ -192,7 +192,7 @@ ary_expand_capa(mrb_state *mrb, struct RArray *a, size_t len)
   if (capa > (size_t)a->aux.capa) {
     mrb_value *expanded_ptr = (mrb_value *)mrb_realloc(mrb, a->ptr, sizeof(mrb_value)*capa);
 
-    a->aux.capa = capa;
+    a->aux.capa = (mrb_int)capa;
     a->ptr = expanded_ptr;
   }
 }