Simplify build instructions
- setting PYTHONPATH is no longer needed to run the lldb CLI on Linux.
- added instructions for setting PYTHONPATH correctly for running scripts in the native interpreter



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@171566 91177308-0d34-0410-b5e6-96231b3b80d8
Mark TestPlatformCommand (test_status) as expected to fail on Linux
- due to bugzilla 14806 (platform status command prints more information on Mac OS X than on Linux)



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@171569 91177308-0d34-0410-b5e6-96231b3b80d8