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doom: Add support for Freedoom IWAD names.

Freedoom has new IWAD names. Support these as fallbacks if no other
IWAD file can be found, but prefer FreeDM as it has Vanilla-
compatible levels. Show a warning on startup if running using the
main Freedoom IWADs.

--- a/src/d_iwad.c

+++ b/src/d_iwad.c

@@ -48,6 +48,9 @@

     { "doom1.wad",    doom,      shareware,  "Doom Shareware" },

     { "chex.wad",     pack_chex, shareware,  "Chex Quest" },

     { "hacx.wad",     pack_hacx, commercial, "Hacx" },

+    { "freedm.wad",   doom2,     commercial, "FreeDM" },

+    { "freedoom2.wad", doom2,    commercial, "Freedoom: Phase 2" },

+    { "freedoom1.wad", doom,     retail,     "Freedoom: Phase 1" },

     { "heretic.wad",  heretic,   retail,     "Heretic" },

     { "heretic1.wad", heretic,   shareware,  "Heretic Shareware" },

     { "hexen.wad",    hexen,     commercial, "Hexen" },

--- a/src/doom/d_main.c

+++ b/src/doom/d_main.c

@@ -1387,6 +1387,18 @@

     I_PrintStartupBanner(gamedescription);

     PrintDehackedBanners();

+    // Freedoom's IWADs are Boom-compatible, which means they usually

+    // don't work in Vanilla (though FreeDM is okay). Show a warning

+    // message and give a link to the website.

+    if (W_CheckNumForName("FREEDOOM") >= 0 && W_CheckNumForName("FREEDM") < 0)

+    {

+        printf(" WARNING: You are playing using one of the Freedoom IWAD\n"

+               " files, which might not work in this port. See this page\n"

+               " for more information on how to play using Freedoom:\n"

+               "   http://www.chocolate-doom.org/wiki/index.php/Freedoom\n");

+        I_PrintDivider();

+    }

+

     DEH_printf("I_Init: Setting up machine state.\n");

     I_CheckIsScreensaver();

     I_InitTimer();