mm(1): removes unnecessary macros

src/mm.c

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2024 DTB <trinity@trinity.moe>
+ * Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
  * SPDX-License-Identifier: AGPL-3.0-or-later
  *
  * This program is free software: you can redistribute it and/or modify it under
@@ -23,9 +24,7 @@
 #include <stdlib.h> /* free(3), realloc(3) */
 #include <string.h> /* strcmp(3), strerror(3) */
 #include <unistd.h> /* getopt(3) */
-#if !defined EX_IOERR || !defined EX_OK || !defined EX_OSERR \
-		|| !defined EX_USAGE
-#	include <sysexits.h>
+#include <sysexits.h>
 #endif
 extern int errno;