INT 21 O - Novell NetWare, Alloy NTNX - CLEAR FILE (FCB)
        AH = CEh
        DS:DX -> FCB (see AH=0Fh)
Return: AL = error code
Desc:   unlocks file and removes it from log table, then closes all opened and
          logged occurrences
Note:   this function was added in NetWare 4.0, but was removed some time prior
          to Advanced NetWare 2.15, and is no longer listed in current Novell
          documentation
SeeAlso: AH=CAh,AH=CFh,AH=EDh"NetWare"

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