buffer output when exiting absmi.

C/exec.c

@@ -1066,6 +1066,7 @@ do_goal(Term t, yamop *CodeAdr, int arity, CELL *pt, int top USES_REGS)
   S = CellPtr (RepPredProp (PredPropByFunc (Yap_MkFunctor(AtomCall, 1),0)));	/* A1 mishaps */
 
   out = exec_absmi(top PASS_REGS);
+  Yap_flush();
   //  if (out) {
   //    out = Yap_GetFromSlot(sl);
   //  }

H/Yapproto.h

@@ -498,6 +498,7 @@ void    STD_PROTO(Yap_init_optyap_preds,(void));
 
 /* pl-file.c */
 struct PL_local_data *Yap_InitThreadIO(int wid); 
+void Yap_flush(void);
 
 static inline
 yamop *

os/pl-file.c

@@ -4671,6 +4671,11 @@ EndPredDefs
 
 #if __YAP_PROLOG__
 
+void Yap_flush(void)
+{
+  flush_output(0);
+}
+
 void *
 Yap_GetStreamHandle(Atom at)
 { GET_LD