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doom: use wadfs to expose music lumps

launch wadfs after detecting main wad, exposing GENMIDI and music lumps
under /mnt/wad.  /bin/dmus can then use them directly, and wadfs doesn't
need to be started manually.

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

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

@@ -635,6 +635,11 @@

 		gamemode = indetermined;

 		return;

 	}

+	if(gamemode != indetermined && rfork(RFPROC|RFFDG) == 0){

+		close(2);

+		execl("/bin/games/wadfs", "wadfs", wadfile, nil);

+		sysfatal("execl: %r");

+	}

 	strncpy(basedefault, wadfile, sizeof(basedefault)-5);

 	basedefault[sizeof(basedefault)-5] = '\0';

 	slash = strrchr(basedefault, '/');

--- a/sys/src/games/doom/i_sound.c

+++ b/sys/src/games/doom/i_sound.c

@@ -462,15 +462,7 @@

 	case 0:

 		dup(mpfd[1], 1);

 		for(n=3; n<20; n++) close(n);

-		close(0);

-		snprint(name, sizeof(name), "/tmp/doom.%d", getpid());

-		if(create(name, ORDWR|ORCLOSE, 0666) != 0)

-			sysfatal("create: %r");

-		n = W_LumpLength(m->lumpnum);

-		if(write(0, m->data, n) != n)

-			sysfatal("write: %r");

-		if(seek(0, 0, 0) != 0)

-			sysfatal("seek: %r");

+		snprint(name, sizeof(name), "/mnt/wad/d_%s", m->name);

 		if(bind("/fd/1", "/dev/audio", MREPL) < 0)

 			sysfatal("bind: %r");

 		while(loop && fork() > 0){