lang/rust-bin for NetBSD/aarch64

[Robert Swindells <rjs%fdy2.co.uk@localhost>]

I'm getting a size mismatch error for the NetBSD/aarch64 distfile
downloaded from the CDN then 404s from the alternative sites.

% make fetch
=> Bootstrap dependency digest>=20211023: found digest-20220214
=> Fetching rust-1.73.0-aarch64-unknown-netbsd.tar.xz
=> Total size: 161533276 bytes
Trying [2a04:4e42:4b::262]:443 ...
Requesting https://cdn.NetBSD.org/pub/pkgsrc/distfiles/LOCAL_PORTS/rust/rust-1.73.0-aarch64-unknown-netbsd.tar.xz
100% |***********************************|   154 MiB    2.72 MiB/s    00:00 ETA
161515964 bytes retrieved in 00:58 (2.62 MiB/s)
fetch: Size of the file rust-bin-1.73.0/rust-1.73.0-aarch64-unknown-netbsd.tar.xz doesn't match.
Trying [2a04:4e42:4b::262]:80 ...
Requesting http://cdn.NetBSD.org/pub/pkgsrc/distfiles/rust-bin-1.73.0/rust-1.73.0-aarch64-unknown-netbsd.tar.xz
ftp: Error retrieving file `404 Not Found'
fetch: Unable to fetch expected file rust-1.73.0-aarch64-unknown-netbsd.tar.xz
Requesting http://ftp6.NetBSD.org/pub/pkgsrc/distfiles/rust-bin-1.73.0/rust-1.73.0-aarch64-unknown-netbsd.tar.xz
ftp: Error retrieving file `404 Not Found'
fetch: Unable to fetch expected file rust-1.73.0-aarch64-unknown-netbsd.tar.xz
Trying [2001:660:3302:282a:204:75ff:fe9f:9e11]:80 ...
ftp: Can't connect to `2001:660:3302:282a:204:75ff:fe9f:9e11:80': Operation timed out
Trying 132.227.74.11:80 ...
Requesting http://ftp.fr.NetBSD.org/pub/pkgsrc/distfiles/rust-bin-1.73.0/rust-1.73.0-aarch64-unknown-netbsd.tar.xz
ftp: Error retrieving file `404 Not Found'
fetch: Unable to fetch expected file rust-1.73.0-aarch64-unknown-netbsd.tar.xz
Trying [2001:470:a085:999::21]:80 ...
Requesting http://ftp.NetBSD.org/pub/pkgsrc/distfiles/rust-bin-1.73.0/rust-1.73.0-aarch64-unknown-netbsd.tar.xz
ftp: Error retrieving file `404 Not Found'
fetch: Unable to fetch expected file rust-1.73.0-aarch64-unknown-netbsd.tar.xz