Arrow build error with clang-10

[songqing]

Describe the problem

Today, I updated mac os X to the latest version (macOS High Sierra 10.13.5), the version of clang is Apple LLVM version 10.0.0 (clang-1000.10.25.5), but now arrow's build doesn't support the clang version.

In file arrow/cpp/cmake_modules/CompilerInfo.cmake, it only supports to clang-9, so can anyone update the file?

[songqing]

Already submitted PR apache/arrow#2106