Rollup merge of #126805 - Oneirical:weaves-of-testiny, r=Kobzol

Migrate `pdb-alt-path`, `mismatching-target-triples` and `mingw-export-call-convention` `run-make` tests to rmake

Part of #121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).

Needs MSVC try jobs.

try-job: x86_64-mingw
try-job: x86_64-msvc

Author: GuillaumeGomez