Use malloc/free for file list items (#311)

For Quake installs with lots of mods containing large pak files the changes in b37e57f ended up fragmenting the zone buffer due to a repeated pattern of temporarily allocating larger buffers for the pak files, followed by a small persistent allocation for the mod info, followed by pak file deallocation.

Switching the file list items from zone allocation to general-purpose malloc avoids this pathological case.

Quake/host_cmd.c

@@ -76,7 +76,7 @@ static filelist_item_t *FileList_AddWithData (const char *name, const void *data
 			return item;
 	}
 
-	item = (filelist_item_t *) Z_Malloc(sizeof(filelist_item_t) + datasize);
+	item = (filelist_item_t *) malloc (sizeof(filelist_item_t) + datasize);
 	q_strlcpy (item->name, name, sizeof(item->name));
 	if (datasize)
 	{
@@ -131,7 +131,7 @@ static void FileList_Clear (filelist_item_t **list)
 	while (*list)
 	{
 		blah = (*list)->next;
-		Z_Free(*list);
+		free (*list);
 		*list = blah;
 	}
 }