Remove cargo publish workaround

This wasn't really working, the compile succeeded during cargo publish
but the sources are still not included in the crate.
This is because cargo ignores all subdirectories with a Cargo.toml file:
rust-lang/cargo#8597

src/lib.rs

@@ -365,7 +365,6 @@ fn prepare_source(
     source: &Source,
     generated_project_dir: &Path,
     source_file: &Path,
-    crate_dir: &Path,
     args: &MatchTelecommandArgs,
 ) -> syn::Result<(Option<File>, PathBuf)> {
     Ok(match source {
@@ -416,38 +415,10 @@ fn prepare_source(
             let generated_project_dir = if path.is_absolute() {
                 path.clone()
             } else {
-                // Cargo publish copies the source files into a new directory, which can break relative paths.
-                // Attempt to recover the original source code path.
-                let Ok(crate_name) = std::env::var("CARGO_PKG_NAME") else {
-                    return Err(Error::new(
-                        Span::call_site(),
-                        "Unable to get crate name",
-                    ));
-                };
-                let Ok(crate_version) = std::env::var("CARGO_PKG_VERSION") else {
-                    return Err(Error::new(
-                        Span::call_site(),
-                        "Unable to get crate version",
-                    ));
-                };
-                let cargo_publish_path = PathBuf::from("target")
-                    .join("package")
-                    .join(format!("{crate_name}-{crate_version}"));
-                let source_dir = source_file
+                source_file
                     .parent()
-                    .expect("Should be able to resolve the parent directory of the source file");
-                let base_path = if crate_dir.ends_with(&cargo_publish_path) {
-                    let relative_source_path =
-                        source_dir.strip_prefix(crate_dir).unwrap_or(source_dir);
-                    let mut base_path = crate_dir;
-                    for _ in cargo_publish_path.iter() {
-                        base_path = base_path.parent().expect("Should be able to remove path parts after checking that a path ends with them");
-                    }
-                    base_path.join(relative_source_path)
-                } else {
-                    source_dir.to_path_buf()
-                };
-                base_path.join(path)
+                    .expect("Should be able to resolve the parent directory of the source file")
+                    .join(path)
             };
             if !generated_project_dir.exists() {
                 return Err(Error::new(
@@ -496,7 +467,6 @@ fn compile_rust(args: MatchTelecommandArgs) -> syn::Result<PathBuf> {
             &args.sources[i],
             &generated_project_dir,
             &source_file,
-            &crate_dir,
             &args,
         ) {
             Ok((lock_file, new_generated_project_dir)) => {