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hexen: Show a startup warning if using v1.0 IWAD.

The Hexen v1.0 IWAD file differs too much from the v1.1 IWAD file and
can't be reasonably supported by us. Show a warning message on startup
if the user appears to be trying to play using the v1.0 IWAD file.
This fixes #537.

--- a/src/hexen/h2_main.c

+++ b/src/hexen/h2_main.c

@@ -269,6 +269,17 @@

 	gamemode = shareware;

 	maxplayers = 4;

     }

+

+    // The v1.0 IWAD file is missing a bunch of lumps.

+    if (W_CheckNumForName("CLUS1MSG") == -1)

+    {

+        printf(

+            "** WARNING: You are playing with the Hexen v1.0 IWAD. This\n"

+            "** isn't supported by " PACKAGE_NAME ", and you may find that\n"

+            "** the game will crash. Please upgrade to the v1.1 IWAD file.\n"

+            "** See here for more information:\n"

+            "**   http://www.doomworld.com/classicdoom/info/patches.php\n");

+    }

 }

 // Set the gamedescription string.