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ARROW-10385: [C++][Gandiva] Add support for LLVM 11

LLVM link failures in MinGW build are caused by https://github.com/msys2/MINGW-packages/issues/7170 .
They aren't fixed by this pull request. The problem will be fixed in upstream.

Closes #8521 from kou/cpp-llvm-11

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>