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doom: Allow warp up to MAP40 to match Vanilla.

Vanilla Doom allows warp with the IDCLEV cheat up to MAP40, though it
normally crashes. Match this behavior and set MAP40 as the maximum
rather than MAP34. This fixes #181 (thanks Alexandre Xavier).

--- a/src/doom/st_stuff.c

+++ b/src/doom/st_stuff.c

@@ -654,14 +654,16 @@

 	  && ((epsd > 1) || (map > 9)))

 	return false;

+      // The source release has this check as map > 34. However, Vanilla

+      // Doom allows IDCLEV up to MAP40 even though it normally crashes.

       if ((gamemode == commercial)

-	&& (( epsd > 1) || (map > 34)))

+	&& (( epsd > 1) || (map > 40)))

 	return false;

       // So be it.

       plyr->message = DEH_String(STSTR_CLEV);

       G_DeferedInitNew(gameskill, epsd, map);

-    }    

+    }

   }

   return false;

 }