- moved iwadinfo.txt to zd_extra.pk3.

This was done for two reasons:

1. It forces loading of zd_extra.pk3 for the stock IWADs, eliminating a certain kind of user error.
2. It removes the stock IWAD definitions for custom games that distribute the engine along with their data, so that it doesn't pick up on Steam and GOG installations and shows an inappropriate IWAD picker.

src/d_iwad.cpp

@@ -247,10 +247,10 @@ void FIWadManager::ParseIWadInfo(const char *fn, const char *data, int datasize,
 //
 //==========================================================================
 
-FIWadManager::FIWadManager(const char *fn)
+FIWadManager::FIWadManager(const char *fn, const char *optfn)
 {
-	FResourceFile *resfile = FResourceFile::OpenResourceFile(fn, true);
-	if (resfile != NULL)
+	FResourceFile *resfile = FResourceFile::OpenResourceFile(optfn, true);
+	if (resfile != NULL && 0)
 	{
 		uint32_t cnt = resfile->LumpCount();
 		for(int i=cnt-1; i>=0; i--)
@@ -265,11 +265,11 @@ FIWadManager::FIWadManager(const char *fn)
 			}
 		}
 		delete resfile;
-	}
 		if (mIWadNames.Size() == 0 || mIWadInfos.Size() == 0)
 		{
 			I_FatalError("No IWAD definitions found");
 		}
+	}
 }
 
 

src/d_main.cpp

@@ -2399,7 +2399,7 @@ void D_DoomMain (void)
 
 	FString optionalwad = BaseFileSearch(OPTIONALWAD, NULL, true);
 
-	iwad_man = new FIWadManager(basewad);
+	iwad_man = new FIWadManager(basewad, optionalwad);
 
 	// Now that we have the IWADINFO, initialize the autoload ini sections.
 	GameConfig->DoAutoloadSetup(iwad_man);
@@ -2429,7 +2429,7 @@ void D_DoomMain (void)
 
 		if (iwad_man == NULL)
 		{
-			iwad_man = new FIWadManager(basewad);
+			iwad_man = new FIWadManager(basewad, optionalwad);
 		}
 		const FIWADInfo *iwad_info = iwad_man->FindIWAD(allwads, iwad, basewad, optionalwad);
 		gameinfo.gametype = iwad_info->gametype;

src/d_main.h

@@ -150,7 +150,7 @@ class FIWadManager
 	void AddIWADCandidates(const char *dir);
 	void ValidateIWADs();
 public:
-	FIWadManager(const char *fn);
+	FIWadManager(const char *fn, const char *fnopt);
 	const FIWADInfo *FindIWAD(TArray<FString> &wadfiles, const char *iwad, const char *basewad, const char *optionalwad);
 	const FString *GetAutoname(unsigned int num) const
 	{