refactor: mark no_mangle attributes as unsafe

See https://doc.rust-lang.org/nightly/edition-guide/rust-2024/unsafe-attributes.html

Author: xangelix

multivers-runner/src/lib.rs

@@ -26,7 +26,7 @@ use build::{Build, Executable};
 /// - `argc` must never be negative.
 /// - `argv` and `envp` must be null-terminated arrays of valid pointers to null-terminated strings.
 /// - Each element of `argv` and `envp` must be valid for reads of bytes up to and including the null terminator.
-#[no_mangle]
+#[unsafe(no_mangle)]
 #[cfg(not(test))]
 pub unsafe extern "C" fn main(argc: i32, argv: *const *const i8, envp: *const *const i8) {
     let result = unsafe { run(argc, argv, envp) };

tests/test-nothing/src/main.rs

@@ -3,17 +3,17 @@
 #![cfg_attr(windows, windows_subsystem = "console")]
 
 #[used]
-#[no_mangle]
+#[unsafe(no_mangle)]
 pub static _fltused: i32 = 0;
 
 #[cfg(windows)]
-#[no_mangle]
+#[unsafe(no_mangle)]
 pub unsafe extern "C" fn mainCRTStartup() -> ! {
     windows_sys::Win32::System::Threading::ExitProcess(0);
 }
 
 #[cfg(target_os = "linux")]
-#[no_mangle]
+#[unsafe(no_mangle)]
 pub unsafe extern "C" fn _start() {
     let _ = syscalls::syscall!(syscalls::Sysno::exit, 0);
 }