Makefile, true(1), false(1): ported true and false back to C for simplicity and size

src/false.c

@@ -1,5 +1,4 @@
 /*
- * Copyright (c) 2023 DTB <trinity@trinity.moe>
  * Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
  * SPDX-License-Identifier: CC0
  *
@@ -7,5 +6,4 @@
  * <http://creativecommons.org/publicdomain/zero/1.0>.
  */
 
-
-fn main() { }
+int main() { return 1; }

src/true.c

@@ -1,5 +1,4 @@
 /*
- * Copyright (c) 2023 DTB <trinity@trinity.moe>
  * Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
  * SPDX-License-Identifier: CC0
  *
@@ -7,8 +6,4 @@
  * <http://creativecommons.org/publicdomain/zero/1.0>.
  */
 
-use std::process::ExitCode;
-
-fn main() -> ExitCode {
-    ExitCode::from(1)
-}
+int main() {}