Make stripping signatures reproducible on Tor Messenger .exe files

Similar to bug #15539 (closed) for Tor Browser, we should make stripping signatures on .exe files reproducible.

We can use the pe_checksum_fix.py script added in commit e487b6ffca7b023442fd8820eed8345a20310fde: https://gitweb.torproject.org/builders/tor-browser-bundle.git/commit/?id=e487b6ffca7b023442fd8820eed8345a20310fde

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