CMake <3.5 deprecation warning msgpack-c (cpp)

[berhoeckner]

Hi,

we use a rather new CMake (3.29) and now we started seeing deprecation warnings about minimum require versions < 3.5.

i was wondering if #1097 is planed to be committed to the CPP branch as well?

[redboltz]

If you or someone create a PR for C++, I will review and merge it.

[redboltz]

Fixed by #1133