message: utils: run commands using utf-8 string on Windows
diff: #ifndef NOMINMAX
  #define NOMINMAX
  #endif
  +#include <codecvt>
  #include <io.h> /* for _commit */
  #include <shlobj.h>
  @@ -1135,7 +1136,11 @@ fs::path GetSpecialFolderPath(int nFolder, bool fCreate)
  void runCommand(const std::string& strCommand)
  {
  if (strCommand.empty()) return;
  +#ifndef WIN32
  int nErr = ::system(strCommand.c_str());
  +#else
  + int nErr = ::_wsystem(std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>,wchar_t>().from_bytes(strCommand).c_str());
  +#endif
  if (nErr)
  LogPrintf("runCommand error: system(%s) returned %d\n", strCommand, nErr);
  }
  