Make CMake always build test protos into a static library #16251
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Make CMake always build test protos into a static library
When building with
-Dprotobuf_BUILD_SHARED_LIBS=ON
, we currently put all testprotos into their own shared library. PR #15887 seems to be pushing us over a
limit on the number of exported symbols so that this library no longer links
successfully, though.
This change fixes that problem by always building the test protos into a static
library. This should be fine since it's purely for testing and not meant to be
installed. The only things that depend on it are executables, so we don't need
to worry about ODR violations.