fix #H363 - reviving corpses of hiding monsters (trunk only)

From a bug report, reviving a snake corpse
produced a snake monster which was hidden under nothing--it hid under its
own corpse and wasn't revealed when that corpse got used up.  Rather than
fiddling with sequencing to remove the corpse before making the monster,
force any monster who revives in hidden state to unhide.

doc/fixes35.0

@@ -239,6 +239,8 @@ attacking via applied polearm now honors the "confirm" option
 engulfer under influence of conflict or confusion could swallow monster at
 	water/lava/trap spot and not be affected by destination til next move
 unicorn horn restoration no longer overrides sustain ability characteristic
+hider monster revived from corpse would start out hidden (even if own corpse
+	was only object around to hide under)
 
 
 Platform- and/or Interface-Specific Fixes

src/zap.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)zap.c	3.5	2007/03/30	*/
+/*	SCCS Id: @(#)zap.c	3.5	2007/05/30	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -739,6 +739,13 @@ boolean by_hero;
     }
     if (!mtmp) return (struct monst *)0;
 
+    /* hiders shouldn't already be re-hidden when they revive */
+    if (mtmp->mundetected) {
+	mtmp->mundetected = 0;
+	newsym(mtmp->mx, mtmp->my);
+    }
+    if (mtmp->m_ap_type) seemimic(mtmp);
+
     /* if this is caused by the hero there might be a shop charge */
     if (by_hero) {
 	struct monst *shkp = 0;