Add NetBSD support in Host::GetCurrentThreadID
Add NetBSD support in Host::GetCurrentThreadID

Summary:
To retrieve the native thread ID there must be called _lwp_self().

Sponsored by <The NetBSD Foundation>

Reviewers: joerg, clayborg, emaste, labath

Reviewed By: joerg, clayborg, labath

Subscribers: #lldb

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D29264

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@293625 91177308-0d34-0410-b5e6-96231b3b80d8

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