[guix] build chronik on Windows

Summary: This requires clang for some of the rust crates and causes a few extra windows libraries to be included in the binaries.

Test Plan: HOSTS="x86_64-w64-mingw32" contrib/guix/guix-build

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D15577