Advanced Rogue family: fix some potential buffer overflows.

Some code for determining the score file location assumed that PATH_MAX
would be less than 1024, which cannot be guaranteed.

Advanced Rogue 5 and 7, and XRogue, have had the buffers for the file
name enlarged.  UltraRogue never called the functions, so the code has
been deleted instead.

urogue/mdport.c

@@ -401,54 +401,6 @@ md_shellescape()
 #endif
 }
 
-int
-directory_exists(char *dirname)
-{
-    struct stat sb;
-
-    if (stat(dirname, &sb) == 0) /* path exists */
-        return (sb.st_mode & S_IFDIR);
-
-    return(0);
-}
-
-char *
-md_getroguedir()
-{
-    static char path[1024];
-    char *end,*home;
-
-    if ( (home = getenv("ROGUEHOME")) != NULL)
-    {
-        if (*home)
-        {
-            strncpy(path, home, PATH_MAX - 20);
-
-            end = &path[strlen(path)-1];
-
-            while( (end >= path) && ((*end == '/') || (*end == '\\')))
-                *end-- = '\0';
-
-            if (directory_exists(path))
-                return(path);
-        }
-    }
-
-    if (directory_exists("/var/games/roguelike"))
-        return("/var/games/roguelike");
-    if (directory_exists("/var/lib/roguelike"))
-        return("/var/lib/roguelike");
-    if (directory_exists("/var/roguelike"))
-        return("/var/roguelike");
-    if (directory_exists("/usr/games/lib"))
-        return("/usr/games/lib");
-    if (directory_exists("/games/roguelik"))
-        return("/games/roguelik");
-    if (directory_exists(md_gethomedir()))
-	return(md_gethomedir());
-    return("");
-}
-
 char *
 md_getrealname(int uid)
 {