[macOS] LookupError: unknown encoding: cp936

Description

➜  mono ipy.exe
Traceback (most recent call last):
  File "<string>", line 1567, in load_module
  File "<string>", line 596, in _load_module_shim
  File "<string>", line 1210, in load
  File "<string>", line 1190, in _load_unlocked
  File "<string>", line 1119, in _exec
  File "<string>", line 1461, in exec_module
  File "<string>", line 539, in _check_name_wrapper
  File "<string>", line 321, in _call_with_frames_removed
  File "/Library/Frameworks/IronPython.framework/Versions/3.4.0-beta1/Lib/site.py", line 564, in <module>
  File "/Library/Frameworks/IronPython.framework/Versions/3.4.0-beta1/Lib/site.py", line 550, in main
  File "/Library/Frameworks/IronPython.framework/Versions/3.4.0-beta1/Lib/site.py", line 281, in addusersitepackages
  File "/Library/Frameworks/IronPython.framework/Versions/3.4.0-beta1/Lib/site.py", line 257, in getusersitepackages
  File "/Library/Frameworks/IronPython.framework/Versions/3.4.0-beta1/Lib/site.py", line 247, in getuserbase
  File "/Library/Frameworks/IronPython.framework/Versions/3.4.0-beta1/Lib/sysconfig.py", line 595, in get_config_var
  File "/Library/Frameworks/IronPython.framework/Versions/3.4.0-beta1/Lib/sysconfig.py", line 575, in get_config_vars
  File "/Library/Frameworks/IronPython.framework/Versions/3.4.0-beta1/Lib/_osx_support.py", line 393, in customize_config_vars
  File "/Library/Frameworks/IronPython.framework/Versions/3.4.0-beta1/Lib/_osx_support.py", line 135, in _supports_universal_builds
  File "/Library/Frameworks/IronPython.framework/Versions/3.4.0-beta1/Lib/_osx_support.py", line 103, in _get_system_version
LookupError: unknown encoding: cp936IronPython 3.4.0b1 (3.4.0.0010)
[.NETFramework,Version=v4.6 on Mono 6.12.0.182 (tarball Sun Oct  2 19:58:06 UTC 2022) (64-bit)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>

Steps to Reproduce

1. Install the latest .pkg release
2. Install mono with brew
3. cd /Library/Frameworks/IronPython.framework/Versions/3.4.0-beta1/bin && mono ./ipy.exe

Expected behavior: No error

Actual behavior: LookupError

Versions

➜  mono ipy.exe -V
IronPython 3.4.0b1
➜  mono -V
Mono JIT compiler version 6.12.0.182 (tarball Sun Oct  2 19:58:06 UTC 2022)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
	TLS:
	SIGSEGV:       altstack
	Notification:  kqueue
	Architecture:  amd64
	Disabled:      none
	Misc:          softdebug
	Interpreter:   yes
	LLVM:          supported, not enabled.
	Suspend:       hybrid
	GC:            sgen (concurrent by default)

Reproduce the failure with Mono using the reported ipy.exe command, then inspect Lib/_osx_support.py, Lib/sysconfig.py, and Lib/site.py at the traceback locations. Trace why the macOS startup path requests cp936 and verify that launching IronPython on the reported setup completes without the LookupError.