Hi,
I am struggling to debug a task that is failing in CI: 
https://github.com/apache/arrow/pull/8130/checks?check_run_id=1106595772 
<https://github.com/apache/arrow/pull/8130/checks?check_run_id=1106595772>

Looks like a CMake failure and that is strange given my PR only touches 
existing c++ files

-- Found c-ares: /usr/local/include (found version "1.16.1") 
153
 
<https://github.com/apache/arrow/pull/8130/checks?check_run_id=1106595772#step:5:153>CMake
 Error at /usr/local/lib/cmake/grpc/modules/Findc-ares.cmake:43 (add_library):
154
 
<https://github.com/apache/arrow/pull/8130/checks?check_run_id=1106595772#step:5:154>
  add_library cannot create imported target "c-ares::cares" because another
155
 
<https://github.com/apache/arrow/pull/8130/checks?check_run_id=1106595772#step:5:155>
  target with the same name already exists.
156
 
<https://github.com/apache/arrow/pull/8130/checks?check_run_id=1106595772#step:5:156>Call
 Stack (most recent call first):
157
 
<https://github.com/apache/arrow/pull/8130/checks?check_run_id=1106595772#step:5:157>
  /usr/local/lib/cmake/grpc/gRPCConfig.cmake:15 (find_package)
158
 
<https://github.com/apache/arrow/pull/8130/checks?check_run_id=1106595772#step:5:158>
  cmake_modules/ThirdpartyToolchain.cmake:2461 (find_package)
159
 
<https://github.com/apache/arrow/pull/8130/checks?check_run_id=1106595772#step:5:159>
  CMakeLists.txt:495 (include)
160
 
<https://github.com/apache/arrow/pull/8130/checks?check_run_id=1106595772#step:5:160>

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