Clean up LLDB CMake build output
- remove "-debug" flag from swig scripts
- use "echo -n" instead of "echo" in dummy target to avoid printing a useless newline



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@176597 91177308-0d34-0410-b5e6-96231b3b80d8