Merge branch 'bug33212_035' into maint-0.3.5

  o Minor bugfixes (rust, build):

    - Fix a syntax warning given by newer versions of Rust, and creating

      problems for our continuous integration.

      Fixes bug 33212; bugfix on 0.3.5.1-alpha.

/// before concluding that someone is trying to DoS us

///

/// C_RUST_COUPLED: protover.c `MAX_PROTOCOLS_TO_EXPAND`

const MAX_PROTOCOLS_TO_EXPAND: usize = (1 << 16);

const MAX_PROTOCOLS_TO_EXPAND: usize = 1 << 16;

/// The maximum size an `UnknownProtocol`'s name may be.

pub(crate) const MAX_PROTOCOL_NAME_LENGTH: usize = 100;