sleeping monster responding to attacks

when msleeping is set, mcanmove is not cleared.  mcanmove applies only to
mfrozen.  So, mattackm needs to test both mcanmove and msleeping.
mattackm will not wake the defender if the attack misses.

doc/fixes34.3

@@ -83,6 +83,7 @@ allow Conflict-resistant monsters to respond to conflict attacks rather than
 prefer herbivorous stone-to-flesh message when hero is a vegitarian
 try even harder to avoid incorrect map display while changing levels
 no "freaked" message by exploding black light, unless you really are
+sleeping monster could respond to attacks by other monsters
 
 
 Platform- and/or Interface-Specific Fixes

src/mhitm.c

@@ -203,7 +203,7 @@ mattackm(magr, mdef)
     struct permonst *pa, *pd;
 
     if (!magr || !mdef) return(MM_MISS);		/* mike@genat */
-    if (!magr->mcanmove) return(MM_MISS);		/* riv05!a3 */
+    if (!magr->mcanmove || magr->msleeping) return(MM_MISS);
     pa = magr->data;  pd = mdef->data;
 
     /* Grid bugs cannot attack at an angle. */