bootstrap: ensure host std when cross-compiling tools, fixes #85320
bootstrap: ensure host std when cross-compiling tools, fixes #85320

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