add missing prototype for ClearHostCallbacks_r()
static int MultiBreakVolumeLaterCallBack(struct host *host, int isheld, struct VCBParams *parms);
static int lih_r(register struct host *host, register int held, register struct host *hostp);
static int GetSomeSpace_r(struct host *hostp, int locked);
+static int ClearHostCallbacks_r(struct host *hp, int locked);
#define GetCB() ((struct CallBack *)iGetCB(&cbstuff.nCBs))
#define GetFE() ((struct FileEntry *)iGetFE(&cbstuff.nFEs))