Ensure assert_fail and abort have noreturn attribute

src/header/assert/cbindgen.toml

@@ -7,3 +7,6 @@ cpp_compat = true
 
 [enum]
 prefix_with_name = true
+
+[fn]
+no_return = "__attribute__((noreturn))"

src/header/assert/mod.rs

@@ -12,7 +12,7 @@ pub unsafe extern "C" fn __assert_fail(
     file: *const c_char,
     line: c_int,
     cond: *const c_char,
-) {
+) -> ! {
     let func = CStr::from_ptr(func).to_str().unwrap();
     let file = CStr::from_ptr(file).to_str().unwrap();
     let cond = CStr::from_ptr(cond).to_str().unwrap();