killdaemons: explicitly set the ctypes signatures
When I tried importing util.posixfile to work around removing a file opened by
another process on Windows, it brought along the declarations in win32.py, which
broke the error handling[1]. It doesn't seem worth hacking killdaemons[2] just
to isolate these declarations in win32.py, so just declare them here to prevent
any future issues. (win32.py mentions the declarations are required by pypy.)
[1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-May/097905.html
[2] https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-May/097907.html
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