llcppsymg:c++ case with inih/58

[luoliwoshang]

class INIReader {
  public:
    INI_API explicit INIReader(const char *buffer, size_t buffer_size);
}

in linux's got mangle name _ZN9INIReaderC1ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE and in macos got mangle name _ZN9INIReaderC1ERKNSt3__112basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEE