Separate 3rdParty folders for separate platforms
Separate 3rdParty folders for separate platforms

because they may have different sets of dependencies, and vcpkg complains if a port was built but no longer present (though it didn't before)
also because they may potentially use different versions of a port, or be differently patched which could cause much more subtle problems

meganz/sdk,meganz/sdk,meganz/sdk,meganz/sdk,meganz/sdk,meganz/sdk,meganz/sdk