fake player creation on Astral

Reported by entrez:  fake player monsters on the Astral Plane level
were giving "<role> suddenly appears!" feedback if they could be
seen or sensed when the hero arrived on that level.

They're generated separately from the level itself so the message
suppression in place during level creation didn't guard against it.

doc/fixes3-7-0.txt

@@ -1374,6 +1374,9 @@ command line processing interleaved with options file processing is complex:
 	a recent change to make 'color' show up for tty in the short options
 	menu resulted in 'nethack --windowtype:X11' running X11 with ascii map
 	('NETHACKOPTIONS=windowtype:X11 nethack' continued to default to tiles)
+when the Astral level got created, any fake player character monsters that
+	were seen or sensed when created were reported as "<mon> suddenly
+	appears!" rather than be treated as part of level's initial population
 
 curses: 'msg_window' option wasn't functional for curses unless the binary
 	also included tty support

src/mplayer.c

@@ -128,7 +128,7 @@ mk_mplayer(struct permonst *ptr, coordxy x, coordxy y, boolean special)
     if (!In_endgame(&u.uz))
         special = FALSE;
 
-    if ((mtmp = makemon(ptr, x, y, NO_MM_FLAGS)) != 0) {
+    if ((mtmp = makemon(ptr, x, y, special ? MM_NOMSG : NO_MM_FLAGS)) != 0) {
         short weapon, armor, cloak, helm, shield;
         int quan;
         struct obj *otmp;