Heads-up: -Csoft-float is deprecated

[RalfJung]

This repo uses the -Csoft-float flag here:

firmware-update/Makefile

Line 54 in 1a37d68

-C soft-float \

This flag is a NOP on most targets, and quite dangerous on 32bit ARM *hf targets unless you build your own standard library also with that flag. For this reason, the flag is being deprecated. See rust-lang/rust#129893 for context.

If you are crucially relying on this flag on a target where it actually has an effect (i.e., a 32bit ARM *hf target), we'd like to hear about that. :) If not, we'd recommend to remove this flag so that you won't get deprecation warnings when Rust 1.83 is released.