[lldb] Stop generating swig bindings for SBLaunchInfo copy constructor

Given the line
```
launch_info = lldb.SBLaunchInfo(None)
```

We see different behaviors across different versionf of swig. On some
older versions of swig (e.g. 3.0.2) this line fails because it attempts
to use the copy constructor and blows up with an invalid null reference.
On newer versions of swig, this is correctly routed to the constructor
taking a pointer.

Prior to generating the swig bindings with the API headers,
SBLaunchInfo's copy constructor was not exposed so we're effectively
going back to the old behavior anyway.

Differential Revision: https://reviews.llvm.org/D144228