core: move irrt c++ sources to /nac3core/irrt

nac3core/build.rs

@@ -110,14 +110,14 @@ fn compile_irrt_test(irrt_dir: &Path, out_dir: &Path) {
             o
         })
         .unwrap();
-    println!("cargo:rerun-if-changed={path}", path = irrt_test_cpp_path.to_str().unwrap());
+    println!("cargo:rerun-if-changed={}", out_dir.to_str().unwrap());
 }
 
 fn main() {
     let out_dir = env::var("OUT_DIR").unwrap();
     let out_dir = Path::new(&out_dir);
 
-    let irrt_dir = Path::new("src/codegen/irrt");
+    let irrt_dir = Path::new("./irrt");
 
     compile_irrt(irrt_dir, out_dir);