Fix format specifiers for size_t

Author: nobu

ext/bigdecimal/bigdecimal.c

@@ -6453,7 +6453,7 @@ VPrint(FILE *fp, const char *cntl_chr, Real *a)
  }
  }
  nc += fprintf(fp, "E%"PRIdSIZE, VpExponent10(a));
- nc += fprintf(fp, " (%"PRIdVALUE", %lu, %lu)", a->exponent, a->Prec, a->MaxPrec);
+ nc += fprintf(fp, " (%"PRIdVALUE", %"PRIuSIZE", %"PRIuSIZE")", a->exponent, a->Prec, a->MaxPrec);
  }
  else {
  nc += fprintf(fp, "0.0");