string.c: make `mrb_str_len_{inum,dbl}()` static.

src/load.c

@@ -60,8 +60,6 @@ str_to_double(mrb_state *mrb, const char *p)
 }
 #endif
 
-mrb_value mrb_str_len_to_inum(mrb_state *mrb, const char *str, size_t len, mrb_int base, int badcheck);
-
 static mrb_bool
 read_irep_record_1(mrb_state *mrb, const uint8_t *bin, size_t *len, uint8_t flags, mrb_irep **irepp)
 {

src/string.c

@@ -2199,7 +2199,7 @@ mrb_str_split_m(mrb_state *mrb, mrb_value str)
   return result;
 }
 
-mrb_value
+static mrb_value
 mrb_str_len_to_inum(mrb_state *mrb, const char *str, size_t len, mrb_int base, int badcheck)
 {
   const char *p = str;
@@ -2440,7 +2440,7 @@ mrb_str_to_i(mrb_state *mrb, mrb_value self)
 }
 
 #ifndef MRB_NO_FLOAT
-double
+static double
 mrb_str_len_to_dbl(mrb_state *mrb, const char *s, size_t len, mrb_bool badcheck)
 {
   char buf[DBL_DIG * 4 + 20];