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Heretic: Gracefully error out when player starts are missing (fix #1122)

--- a/src/heretic/doomdef.h

+++ b/src/heretic/doomdef.h

@@ -553,6 +553,7 @@

 extern mapthing_t *deathmatch_p;

 extern mapthing_t deathmatchstarts[10];

 extern mapthing_t playerstarts[MAXPLAYERS];

+extern boolean playerstartsingame[MAXPLAYERS];

 extern int mouseSensitivity;

--- a/src/heretic/p_mobj.c

+++ b/src/heretic/p_mobj.c

@@ -1052,6 +1052,7 @@

     {

         // save spots for respawning in network games

         playerstarts[mthing->type - 1] = *mthing;

+        playerstartsingame[mthing->type - 1] = true;

         if (!deathmatch)

         {

             P_SpawnPlayer(mthing);

--- a/src/heretic/p_setup.c

+++ b/src/heretic/p_setup.c

@@ -60,6 +60,7 @@

 mapthing_t deathmatchstarts[10], *deathmatch_p;

 mapthing_t playerstarts[MAXPLAYERS];

+boolean playerstartsingame[MAXPLAYERS];

 /*

 =================

@@ -277,6 +278,18 @@

         spawnthing.type = SHORT(mt->type);

         spawnthing.options = SHORT(mt->options);

         P_SpawnMapThing(&spawnthing);

+    }

+

+    if (!deathmatch)

+    {

+        for (i = 0; i < MAXPLAYERS; i++)

+        {

+            if (playeringame[i] && !playerstartsingame[i])

+            {

+                I_Error("P_LoadThings: Player %d start missing (vanilla crashes here)", i + 1);

+            }

+            playerstartsingame[i] = false;

+        }

     }

     W_ReleaseLumpNum(lump);