ARROW-12780: [CI][C++] Install necessary packages for MinGW builds
ARROW-12780: [CI][C++] Install necessary packages for MinGW builds

libxml2 is now required to run clang on MinGW. This can be found by `strace`ing clang under MinGW; a dialog will pop up telling you the name of any missing libraries (ldd, notably, may not give you this info).

Closes #10319 from lidavidm/arrow-12780

Authored-by: David Li <dc24f9cfc84fb1675ce65c8444a2c3e2f0e5f297@gmail.com>
Signed-off-by: Sutou Kouhei <73218711cdd5d5c30ac66da3cc4d9d9204caf34b@clear-code.com>

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