ARROW-17281: [C++] Fix cache size reporting on Windows (#13813)
ARROW-17281: [C++] Fix cache size reporting on Windows (#13813)

Authored-by: Yibo Cai <e732a3f0de35687e82bda0008a72e443d2f69704@arm.com>
Signed-off-by: Sutou Kouhei <73218711cdd5d5c30ac66da3cc4d9d9204caf34b@clear-code.com>
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