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Sutou KouheiKrisztián Szűcs
c51c19e2ebf
Sutou Kouhei authored and Krisztián Szűcs committed 62f8c20306f
ARROW-12326: [C++] Avoid needless c-ares detection

If we use system gRPC, we don't need to detect c-ares.

This change also simplifies gRPC detection. System gRPC detection
requires CMake config or pkg-config. System gRPC detection by
gRPC_ROOT is removed because we can't maintain Abseil dependencies.

Closes #9977 from kou/cpp-avoid-needless-c-ares-detection

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>