is_lminion should only match lawful minions

When Angels were introduced, they were always lawful.  Somewhere along the
line, non-lawful angels were added, but is_lminion and uses of it was never
updated to address this change.  Among other things, this resulted in
non-lawful angels delivering messages via #chat that are only appropriate
for lawful angels.  That is addressed simply by changing the definition of
is_lminion, which must take a struct monst, not a permonst, to return valid
results.  Also, non-lawful angels should summon appropriate monsters, not
lawful minions.

src/makemon.c

@@ -1439,7 +1439,7 @@ register int otyp;
 	    if (mtmp->data->mlet == S_DEMON) {
 		/* demons never get blessed objects */
 		if (otmp->blessed) curse(otmp);
-	    } else if(is_lminion(mtmp->data)) {
+	    } else if(is_lminion(mtmp)) {
 		/* lawful minions don't get cursed, bad, or rusting objects */
 		otmp->cursed = FALSE;
 		if(otmp->spe < 0) otmp->spe = 0;