libkai v2.2.1 for OS/2

v2.2.1:
    * Built with gcc v9.2.0(rpm)
    * Fixed dart: `DART error(xxxx):Multiple defined.' error at startup
    * Fixed dart: Dead-lock in dartStop()
    * Fixed server: Dead-lock when calling kaiClose() in MCI_CLOSE of MCD
                    such as ksoftseq(#11)
    * Fixed kai: A default audio is not detected correctly even if it changes.
                 (ksoftseq#12)