ignore `#[inline]` functions

[tyt2y3]

Originally posted by @tyt2y3 in https://github.com/SeaQL/FireDBG.for.Rust/discussions/12#discussioncomment-7843286

Parser should also parse macro annotations, e.g. #[inline] and more complex expressions like #[cfg_attr(..)]. May be we can also have #[firedbg(..)], but we have to create a macro support library as well.