Add more NetBSD platform glue for lldb

Summary:
These changes are still incomplete, but  we are almost there.

Changes:
- CMake and gmake code
- SWIG code
- minor code additions

Reviewers: emaste, joerg

Subscribers: youri, akat1, brucem, lldb-commits, joerg

Differential Revision: http://reviews.llvm.org/D14042

llvm-svn: 252403