macOS built Python3.11b5 can't find lib-dynload in relocatable framework if framework is relocated and python run from external symlink

Bug report

A build of Python 3.11b5's fails to find lib-dynload path if the following normally ok combination of criteria are met:

• The framework is made or modified in such a away to be relocatable (dynamic links are relative using @loader_path, etc) instead of absolute path
• The framework is installed in a location it wasn't built at
• python is executed by a symlink from elsewhere

Your environment

To reproduce this easily, I decompressed the installable package into my home directory, making a framework structure that would normally run. I do have to modify the linking to work relocated, using the following commands:

 install_name_tool -change /Library/Frameworks/Python.framework/Versions/3.11/Python @loader_path/../Python Python.framework/Versions/3.11/bin/python3.11
 install_name_tool -change /Library/Frameworks/Python.framework/Versions/3.11/Python @loader_path/../../../../Python Python.framework/Versions/3.11/Resources/Python.app/Contents/MacOS/Python

I then symlink the python executable.

ln -s Python.framework/Versions/3.11/bin/python3.11 python3.11

the following command works fine

./Python.framework/Versions/3.11/bin/python3.11 -c "import math"

while this does not

 ./python3.11 -c "import math"
Could not find platform dependent libraries <exec_prefix>
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'math'

even though the shell itself works normally, just the lib-dynload is not being found.

I can make it work with the attached patch, but I don't assume it is the correct way to fix it
relocated_framework.patch.gz
.

Start by reproducing the direct-executable and external-symlink commands on macOS, comparing the successful import with the missing lib-dynload case. Then inspect the attached relocated_framework.patch.gz and the framework startup/path handling it changes. Done means importing math works when the relocated framework is run through the external symlink.