Using named args means that you don't need to keep track of 5 positional
args.

This relands the original commit for the versioning script in LLDB. This
commit uses '>' for output from `unifdef` for platforms that have that
executable but do not have the `-o` option. It also fixes the Xcode
build by adding a dependency between the liblldb-header-staging target
in the source/API/CMakeLists.txt the `liblldb-resource-headers` target
in LLDBFramework.cmake.

Original patch: https://github.com/llvm/llvm-project/pull/141116

Reverts llvm/llvm-project#141116. It's breaking the Xcode build as well
as the build on AIX.

This commit creates a Python script that fixes up the versioning
information in lldb-defines.h. It also moves the build logic for fixing
up the lldb headers from being in the framework only to being in the
same location that we create the liblldb target.