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ARROW-12589: [C++] Compiling on windows doesn't work when -DARROW_WITH_BACKTRACE=OFF

    [4/116] Building CXX object src/arrow/CMakeFiles/arrow_shared.dir/Unity/unity_17_cxx.cxx.obj
    FAILED: src/arrow/CMakeFiles/arrow_shared.dir/Unity/unity_17_cxx.cxx.obj
    C:/msys64/mingw64/bin/ccache.exe C:\msys64\mingw64\bin\c++.exe ...
    In file included from src/arrow/CMakeFiles/arrow_shared.dir/Unity/unity_17_cxx.cxx:3:
    C:/msys64/home/javan/arrow/arrow-master/cpp/src/arrow/filesystem/filesystem.cc:81:28: error: function 'std::ostream& arrow::fs::operator<<(std::ostream&, arrow::fs::FileType)' definition is marked dllimport
    81 | ARROW_EXPORT std::ostream& operator<<(std::ostream& os, FileType ftype) {
    |                            ^~~~~~~~
    [5/116] Building CXX object src/arrow/CMakeFiles/arrow_shared.dir/Unity/unity_2_cxx.cxx.obj

Closes #10188 from amol-/ARROW-12589

Authored-by: Alessandro Molina <amol@turbogears.org>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>