don't genrate code in src/

[Outputs of Build Script](https://doc.rust-lang.org/cargo/reference/build-scripts.html#outputs-of-the-build-script) states that only files in $OUT_DIR may be modified

src/atom_table.rs

@@ -21,7 +21,7 @@ pub struct Atom {
 
 const_assert!(mem::size_of::<Atom>() == 8);
 
-include!("./static_atoms.rs");
+include!(concat!(env!("OUT_DIR"), "/static_atoms.rs"));
 
 impl<'a> From<&'a Atom> for Atom {
     #[inline]