Using build-std does not work

[LunarLambda]

Crate name

gba

Build failure link

https://docs.rs/crate/gba/0.5.3/builds/540808

Additional details

The gba crate is meant for the thumbv4t-none-eabi target, meaning it requires build-std (and the rust-src component). While docs.rs hints at the ability to pass -Z build-std to cargo (https://docs.rs/about/metadata), this doesn't seem to actually work. Not sure if we're doing something wrong or this is simply not support currently, I could not find much documentation regarding using build-std on docs.rs.

Currently our only other option seems to be picking a Tier 1 or 2 target that's 'close enough' (closest would be armv7a-none-eabi I guess?), which seems like it could easily to other weird issues.

[jyn514]

Duplicate of #1561