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

The script used to fix up LLDB's header for use in the macOS framework
contained 2 bugs that this commit addreses:

1. The output contents were appended to the output file multiple times
instead of only being written once.
2. The script was not considering LLDB includes that were *not* from the
SB API.

This commit addresses and fixes both of these bugs and updates the
corresponding test to match.

In the script that's used by RPC to convert LLDB headers to LLDB RPC
headers, there's a bug with how it converts namespace usage. An
overeager regex pattern caused *all* text before any `lldb::` namespace
usage to get replaced with `lldb_rpc::` instead of just the namespace
itself. This commit changes that regex pattern to be less overeager and
modifies one of the shell tests for this script to actually check that
the namespace usage replacement is working correctly.

rdar://154126268

…ers" (#143941)

Reland the script that converts lldb headers to RPC headers. The RPC
test was failing due to the incorrect input filepath being used.

Original commit message:
This commit replaces the shell script that fixes up includes for the
LLDB framework with a Python script. This script will also be used when
fixing up includes for the LLDBRPC.framework.

Reverts llvm/llvm-project#142051

This commit replaces the shell script that fixes up includes for the
LLDB framework with a Python script. This script will also be used when
fixing up includes for the LLDBRPC.framework.

As part of upstreaming LLDB RPC, this commit adds a python script that
is used by LLDB RPC to modify the public lldb header files for use with
RPC.

https://discourse.llvm.org/t/rfc-upstreaming-lldb-rpc/85804

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.