chore: drop the cmd.c cmdCount/cmdLine shim

The shim existed to satisfy Nim's cmdCount/cmdLine globals, which the static
library referenced when it pulled in the command-line machinery. Nothing in
liblogosdelivery.a (nor any archive on the link line) references either symbol
now, and a clean rebuild of the workspace and the basic example links without
it.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

waku-bindings/build.rs

@@ -182,11 +182,6 @@ fn emit_link_flags(nwaku_path: &Path) {
     println!("cargo:rustc-link-lib=static={librln}");
 
     // libbacktrace is not linked: the vendor builds with -d:disable_libbacktrace.
-
-    cc::Build::new()
-        .file("src/cmd.c") // Compile the C file
-        .compile("cmditems"); // Compile it as a library
-    println!("cargo:rustc-link-lib=static=cmditems");
 }
 
 #[cfg(not(doc))]

waku-bindings/src/cmd.c

@@ -1,13 +0,0 @@
-
-/*
-  This file is needed to avoid errors like the following when linking the waku-sys lib crate:
-  <<undefined reference to `cmdCount'>>
-  and
-  <<undefined reference to `cmdLine'>>
-*/
-
-#include <stdio.h>
-
-int cmdCount = 0;
-char** cmdLine = NULL;
-