Fix sysctl check on non-arm Macs

[AnIrishDuck]

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Describe your changes

Simple fix for python bindings on non-arm Macs.

Checklist before requesting a review

• [x] I have performed a self-review of my code.
• [x] If it is a core feature, I have added thorough tests.
• [x] I have added thorough documentation for my code.
• [x] I have tagged PR with relevant project labels. I acknowledge that a PR without labels may be dismissed.
• [x] If this PR addresses a bug, I have provided both a screenshot/video of the original bug and the working solution.
  • (I presume a traceback from the CLI is enough here)

Steps to Reproduce

Try to run python bindings on any non-arm mac where this sysctl does not exist. See this issue for others that have run into this.

Backtrace:

% llm --version
Traceback (most recent call last):
  File "/usr/local/bin/llm", line 5, in <module>
    from llm.cli import cli
  File "/usr/local/Cellar/llm/0.16/libexec/lib/python3.12/site-packages/llm/__init__.py", line 18, in <module>
    from .plugins import pm
  File "/usr/local/Cellar/llm/0.16/libexec/lib/python3.12/site-packages/llm/plugins.py", line 17, in <module>
    pm.load_setuptools_entrypoints("llm")
  File "/usr/local/Cellar/llm/0.16/libexec/lib/python3.12/site-packages/pluggy/_manager.py", line 421, in load_setuptools_entrypoints
    plugin = ep.load()
             ^^^^^^^^^
  File "/usr/local/Cellar/[email protected]/3.12.6/Frameworks/Python.framework/Versions/3.12/lib/python3.12/importlib/metadata/__init__.py", line 205, in load
    module = import_module(match.group('module'))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/Cellar/[email protected]/3.12.6/Frameworks/Python.framework/Versions/3.12/lib/python3.12/importlib/__init__.py", line 90, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/Cellar/llm/0.16/libexec/lib/python3.12/site-packages/llm_gpt4all.py", line 1, in <module>
    from gpt4all import GPT4All as _GPT4All
  File "/usr/local/Cellar/llm/0.16/libexec/lib/python3.12/site-packages/gpt4all/__init__.py", line 1, in <module>
    from .gpt4all import CancellationError as CancellationError, Embed4All as Embed4All, GPT4All as GPT4All
  File "/usr/local/Cellar/llm/0.16/libexec/lib/python3.12/site-packages/gpt4all/gpt4all.py", line 23, in <module>
    from ._pyllmodel import (CancellationError as CancellationError, EmbCancelCallbackType, EmbedResult as EmbedResult,
  File "/usr/local/Cellar/llm/0.16/libexec/lib/python3.12/site-packages/gpt4all/_pyllmodel.py", line 34, in <module>
    if subprocess.run(
       ^^^^^^^^^^^^^^^
  File "/usr/local/Cellar/[email protected]/3.12.6/Frameworks/Python.framework/Versions/3.12/lib/python3.12/subprocess.py", line 571, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['sysctl', '-n', 'sysctl.proc_translated']' returned non-zero exit status 1.

This sysctl clearly does not exist when run independently:

% sysctl -n sysctl.proc_translated                               
sysctl: unknown oid 'sysctl.proc_translated'

See also a similar question on stack overflow.

I don't have access to an arm mac to test on, but this fix should still work as intended there (raise error).

I have verified with this in place that the llm tool now works with the gpt4all plugin enabled:

% llm --version
llm, version 0.16