Add input files to the "prepare swig bindings" step.
Add input files to the "prepare swig bindings" step.

This build phase had no inputs, so you always had to manually
delete LLDBWrapPython.cpp to get it to rebuild.  Add the correct
inputs.


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@341683 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb