message: Disable direct sync on RTEMS
  The O_DSYNC flag is not implemented in the RTEMS posix layer.
diff: @@ -51,6 +51,7 @@ namespace Os {
  case OPEN_SYNC_WRITE:
  flags = O_WRONLY | O_CREAT | O_SYNC;
  break;
  +#ifndef TGT_OS_TYPE_RTEMS
  case OPEN_SYNC_DIRECT_WRITE:
  flags = O_WRONLY | O_CREAT | O_DSYNC
  #ifdef __linux__
  @@ -59,6 +60,7 @@ namespace Os {
  ;
  #endif
  break;
  +#endif
  case OPEN_CREATE:
  flags = O_WRONLY | O_CREAT | O_TRUNC;
  break;
  