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ARROW-5577: [C++][Alpine] Correct googletest shared library paths on non-Windows to fix Alpine build

I had to disable Flight which does not build for me due to SSL linking errors. I opened ARROW-5578 about fixing the Flight build on Alpine

Author: Wes McKinney <wesm+git@apache.org>

Closes #4535 from wesm/gtest-shared-lib-fix and squashes the following commits:

190fb0e12 <Wes McKinney> Correct googltest shared library paths on non-Windows to fix Alpine build