Remove the eh_personality custom and some unused macros

Cargo.toml

@@ -7,3 +7,4 @@ edition = "2021"
 
 [profile.release]
 lto = true
+panic = "abort"

src/main.rs

@@ -1,15 +1,10 @@
-#![feature(lang_items)]
-#![allow(improper_ctypes_definitions)]
 #![no_std]
 #![no_main]
 
 #[no_mangle]
 pub extern "C" fn main() {}
 
-#[lang = "eh_personality"]
+#[panic_handler]
-pub unsafe extern "C" fn rust_eh_personality() -> () {}
-
-#[lang = "panic_impl"]
 fn panic(_info: &::core::panic::PanicInfo) -> ! {
     loop {}
 }