Include the compiler-rt builtins library for Windows and Linux x86

Rust provides the same intrinsics in its standard library, which we can
mark as weak to prefer the C++ ones. But the C++ ones will only be
considered strong symbols and replace them if we explicitly link the
builtins library.

Bug: 1445978
Change-Id: I9239ef7b35be2d2775b31fb0483b108ea8cb15d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4544565


Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1148936}