fix(tools/no-std-check): drop no_mangle attr

[melekes]

fixes:

error: `#[no_mangle]` cannot be used on internal language items
  --> src/lib.rs:47:1
   |
47 | #[no_mangle]
   | ^^^^^^^^^^^^
48 | fn panic(_info: &PanicInfo) -> ! {
   | -------------------------------- should be the internal language item
   |
   = note: Rustc requires this item to have a specific mangled name.
   = note: If you are trying to prevent mangling to ease debugging, many
   = note: debuggers support a command such as `rbreak rust_begin_unwind` to
   = note: match `.*rust_begin_unwind.*` instead of `break rust_begin_unwind` on a specific name

error: could not compile `no-std-check` (lib) due to 1 previous error

[Copilot]

Pull Request Overview

This PR attempts to address a compile error by changing the #[no_mangle] attribute on the panic handler to an #[unsafe(no_mangle)] form.

• Updated the panic handler’s attribute from #[no_mangle] to #[unsafe(no_mangle)]

Comments suppressed due to low confidence (1)

tools/no-std-check/src/lib.rs:47

• The attribute #[unsafe(no_mangle)] is not valid Rust syntax. Remove this attribute—#[panic_handler] is a language item and should not use no_mangle here. If you need to match the panic symbol in a debugger, rely on regex-based breakpoints instead.

#[unsafe(no_mangle)]