[hotfix] Update CMake target for protobuf

[uilianries]

According to the official documentation, the Protobuf target for its libraries should be protobuf::libprotobuf:

https://cmake.org/cmake/help/latest/module/FindProtobuf.html

kudos to SpaceIM

[memsharded]

Merged, but are we sure it is working fine in the examples2 code? I guess it does, because it is tested, maybe it was a copy&paste error?

[uilianries]

Merged, but are we sure it is working fine in the examples2 code? I guess it does, because it is tested, maybe it was a copy&paste error?

It works both cases. The protobuf::libprotobuf and protobuf::protobuf are virtually the same thing. The difference is that protobuf::protobuf is generated by default by Conan client, and protobuf::libprotobuf is the expected target by the official documentation.

I just opened a PR now to examples2, fixing it there too: conan-io/examples2#103