Refine solution file to avoid compilation error for test assemblies on release build.
Refine solution file to avoid compilation error for test assemblies on release build.

undeadlabs/msgpack-cli,scopely/msgpack-cli,msgpack/msgpack-cli,msgpack/msgpack-cli,scopely/msgpack-cli,modulexcite/msgpack-cli,undeadlabs/msgpack-cli,modulexcite/msgpack-cli