MacOS client 2021

@Uroni Many thanks for this. I’ve built the package with this change, and it successfully loads on my build VM.

@Talkabout please try it from here: https://drive.google.com/file/d/1L2musyzL5f-QWVHheJrqX3i1p34Kqo_7/view?usp=sharing

[Note: as I’m building off the 2.4.x branch, the highlighted line was at line 400 of dllman.cpp; I moved it to just before this line:

internetclient_ticket=InternetClient::start(do_leak_check);

Please let me know if I’ve misunderstood your instructions!]