Auto merge of #140273 - matthiaskrgr:rollup-rxmuvkg, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - #137096 (Stabilize flags for doctest cross compilation)
 - #140148 (CI: use aws codebuild for job dist-arm-linux)
 - #140187 ([AIX] Handle AIX dynamic library extensions within c-link-to-rust-dylib run-make test)
 - #140196 (Improved diagnostics for non-primitive cast on non-primitive types (`Arc`, `Option`))
 - #140210 (Work around cygwin issue on condvar timeout)
 - #140213 (mention about `x.py setup` in `INSTALL.md`)
 - #140229 (`DelimArgs` tweaks)
 - #140248 (Fix impl block items indent)

r? `@ghost`
`@rustbot` modify labels: rollup