Brad King ae41216878 FindProtobuf: Link to threads dependency only when Protobuf is found ...

Since commit 03454b0d0d (FindProtobuf: Add missing link dependencies on
threads, 2018-10-31, v3.13.0-rc3~10^2) we add the threads library to the
list of libraries needed for Protobuf.  Update the logic to do this only
when a real protobuf library is actually found.

Fixes: #21161

2020-09-22 08:49:22 -04:00

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