allow big humanoids to wear mummy wrappings

A giant mummy starts out with a mummy wrapping but couldn't wear it.
Allow humanoids who are bigger than human size (including poly'd hero
when applicable) to wear such cloaks.  They won't do so if they are
invisible and the cloak would let hero start seeing them.

src/do_wear.c

@@ -1876,16 +1876,16 @@ canwearobj(struct obj *otmp, long *mask, boolean noisy)
         return 0;
     }
 
-    which = is_cloak(otmp)
-                ? c_cloak
-                : is_shirt(otmp)
-                    ? c_shirt
-                    : is_suit(otmp)
-                        ? c_suit
-                        : 0;
+    which = is_cloak(otmp) ? c_cloak
+            : is_shirt(otmp) ? c_shirt
+              : is_suit(otmp) ? c_suit
+                : 0;
     if (which && cantweararm(g.youmonst.data)
         /* same exception for cloaks as used in m_dowear() */
-        && (which != c_cloak || g.youmonst.data->msize != MZ_SMALL)
+        && (which != c_cloak
+            || ((otmp->otyp != MUMMY_WRAPPING)
+                ? g.youmonst.data->msize != MZ_SMALL
+                : !WrappingAllowed(g.youmonst.data)))
         && (racial_exception(&g.youmonst, otmp) < 1)) {
         if (noisy)
             pline_The("%s will not fit on your body.", which);