Removes the U that comes before the guards passed into the framework
fixup script.

Fixes a test that's failing on LLDB GreenDragon due to a mistake in the
arguments used when calling the framework-header-fix script.

When gathering the headers to fix up and place in LLDB.framework, we
were previously globbing the header files from a location in the build
directory. This commit changes this to glob from the source directory
instead, as we were globbing from the build directory without ensuring
that the necessary files were actually in that location before globbing.

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.

…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.

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.