Adding CMake build system to LLDB. Some known issues remain:
- generate-vers.pl has to be called by cmake to generate the version number
- parallel builds not yet supported; dependency on clang must be explicitly specified

Tested on Linux.
- Building on Mac will require code-signing logic to be implemented.
- Building on Windows will require OS-detection logic and some selective directory inclusion

Thanks to Carlo Kok (who originally prepared these CMakefiles for Windows) and Ben Langmuir
who ported them to Linux!



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@175795 91177308-0d34-0410-b5e6-96231b3b80d8