cleanup after msrv bump

build/main.rs

@@ -45,10 +45,6 @@ fn find_prolog_files(path_prefix: &str, current_dir: &Path) -> Vec<(String, Path
 }
 
 fn main() {
-    if version_check::is_min_version("1.87.0").unwrap_or(false) {
-        println!(r#"cargo:rustc-cfg=rust_version="1.87.0""#);
-    }
-
     let has_rustfmt = Command::new("rustfmt")
         .arg("--version")
         .stdin(Stdio::inherit())