Don't explicitly set update version

Host::GetOSVersion's caller already sets it to UINT32_MAX to determine
which version number components are set.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@184953 91177308-0d34-0410-b5e6-96231b3b80d8
Remove unused include.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@184954 91177308-0d34-0410-b5e6-96231b3b80d8