Update CMake lists of sources to include files added in r175787 and r175323



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@175797 91177308-0d34-0410-b5e6-96231b3b80d8
Fix CommandObjectMultiword to initialize all members, and beef up corresponding test case.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@175798 91177308-0d34-0410-b5e6-96231b3b80d8
Skip another two test cases on Linux that are affected by llvm.org/pr14637



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@175801 91177308-0d34-0410-b5e6-96231b3b80d8