main/rust: rustc --explain incompatible with busybox less

It looks like rustc --explain is using the -r when the pages is less but this option isn't supported by busybox less:

/run/user/1000/tmp$ ln -s /bin/busybox less
/run/user/1000/tmp$ PAGER="less" PATH="$PWD:$PATH" rustc --explain E0463
less: unrecognized option: r

Introduced in: https://github.com/rust-lang/rust/pull/112697

Source: https://github.com/rust-lang/rust/blob/3d1dba830a564d1118361345d7ada47a05241f45/compiler/rustc_driver_impl/src/lib.rs#L580