KINFO_FILE_SIZE is missing in libc on arm64

[yurivict]

The gram-text-editor-3.3.0 project (FreeBSD port editors/gram) fails to compile:

error[E0425]: cannot find value `KINFO_FILE_SIZE` in crate `libc`
   --> crates/fs/src/fs.rs:347:60
    |
347 |         unsafe { (*kif.as_mut_ptr()).kf_structsize = libc::KINFO_FILE_SIZE; }
    |                                                            ^^^^^^^^^^^^^^^ not found in `libc`

libc-0.2.189
FreeBSD 15.1