Background: dotnet/macios#11498
The size of the SSLCipherSuite enum differs by platform. For MacCatalyst we currently always assume that it's 16-bit which is correct on arm64 [but wrong in the system headers]. For x64 it should be 32-bit [and it's definited correctly in the system headers].
Long term we should investigate moving to the Network.framework API but that is big task already tracked in other issues.