message: use _snprintf if MSVC
diff: @@ -4632,7 +4632,11 @@ PUGI__NS_BEGIN
  PUGI__FN bool set_value_convert(String& dest, Header& header, uintptr_t header_mask, float value)
  {
  char buf[128];
  +#if defined(PUGI__MSVC_CRT_VERSION)
  + _snprintf(buf, 128, "%.9g", value);
  +#else
  snprintf(buf, 128, "%.9g", value);
  +#endif
  buf[127] = '\0';
  return set_value_ascii(dest, header, header_mask, buf);
  @@ -4642,7 +4646,11 @@ PUGI__NS_BEGIN
  PUGI__FN bool set_value_convert(String& dest, Header& header, uintptr_t header_mask, double value)
  {
  char buf[128];
  +#if defined(PUGI__MSVC_CRT_VERSION)
  + _snprintf(buf, 128, "%.17g", value);
  +#else
  snprintf(buf, 128, "%.17g", value);
  +#endif
  buf[127] = '\0';
  return set_value_ascii(dest, header, header_mask, buf);
  @@ -7999,7 +8007,11 @@ PUGI__NS_BEGIN
  PUGI__FN void convert_number_to_mantissa_exponent(double value, char* buffer, size_t buffer_size, char** out_mantissa, int* out_exponent)
  {
  // get a scientific notation value with IEEE DBL_DIG decimals
  +#if defined(PUGI__MSVC_CRT_VERSION)
  + _snprintf(buffer, buffer_size, "%.*e", DBL_DIG, value);
  +#else
  snprintf(buffer, buffer_size, "%.*e", DBL_DIG, value);
  +#endif
  buffer[buffer_size - 1] = '\0';
  // get the exponent (possibly negative)
  