message: Fix incorrect code generation on Solaris Sparc.
  On Solaris Sparc, calling NumToString() with a char called the primary
  version, not the signed char or unsigned char specializations, which
  caused integer to string conversions to be missed.
diff: @@ -130,6 +130,9 @@ template<> inline std::string NumToString<signed char>(signed char t) {
  template<> inline std::string NumToString<unsigned char>(unsigned char t) {
  return NumToString(static_cast<int>(t));
  }
  +template<> inline std::string NumToString<char>(char t) {
  + return NumToString(static_cast<int>(t));
  +}
  #if defined(FLATBUFFERS_CPP98_STL)
  template<> inline std::string NumToString<long long>(long long t) {
  char buf[21]; // (log((1 << 63) - 1) / log(10)) + 2
  