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ARROW-17433: [CI][C++] Use Visual Studio 2019 on AppVeyor (#13903)

We can use /external:I for Boost to suppress warnings from Boost
with Visual Studio 2019 or later.


Lead-authored-by: Sutou Kouhei <kou@clear-code.com>
Co-authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>