Auto merge of #42398 - redox-os:master, r=sfackler
Auto merge of #42398 - redox-os:master, r=sfackler

Redox: Switch to repr(C) for syscall structs

graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,graydon/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust