setup: unconditionally do this python 3 step

Differential Revision: https://phab.mercurial-scm.org/D12275

setup.py

@@ -747,7 +747,6 b' class buildhgexe(build_ext):'
 
                 # Also overwrite python3.dll so that hgext.git is usable.
                 # TODO: also handle the MSYS flavor
-                if sys.version_info[0] >= 3:
                     python_x = os.path.join(
                         os.path.dirname(os.fsdecode(buf.value)),
                         "python3.dll",