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setup: copy python3.dll next to hg.exe when building on Windows for hgext.git

Authored by mharbison72.

Description

setup: copy python3.dll next to hg.exe when building on Windows for hgext.git

I thought I took care of this already, but it must have been that I just
manually copied the file over locally when debugging why the pygit2 library
wasn't loading. The problem with that is what was copied over was from py38,
and then running a py39 build hard crashed when the extension was loaded.

Differential Revision: https://phab.mercurial-scm.org/D10301