Build failure on 32 bit freebsd

[JAicewizard]

I am not exactly what you need to fully debug this, but I have attached the generated bindings.rs.

The error is:

error[E0080]: attempt to compute `16_usize - 20_usize`, which would overflow
    --> /wrkdirs/usr/ports/net-im/libsignal/work/target/release/build/boring-sys-a373168ed8011d63/out/bindings.rs:4907:31
     |
4907 |     ["Size of __max_align_t"][::std::mem::size_of::<__max_align_t>() - 20usize];
     |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ evaluation of `generated::_` failed here