Builds Without HAVE_DYNAMIC_LOADING Set Still Expose Features and API Related to Dynamic Modules

Bug report

Bug description:

When CPython is built without HAVE_DYNAMIC_LOADING set, we currently leave out a small handful of code in Python/import.c and Python/importdl.c. However, there is a bunch more that should probably be excluded (via #ifdef HAVE_DYNAMIC_LOADING):

• some functions and constants in Python/importdl.c and Include/internal/pycore_importdl.h
• some functions, constants, and state in Python/import.c and Include/internal/pycore_import.h
• some code in Lib/importlib/_bootstrap_external.py
• maybe some code in Objects/moduleobject.c
• builds for Modules/Setup.stdlib
• checks in Tools/build/check_extension_modules.py
• modules listed by Tools/build/generate_stdlib_module_names.py

(Also see gh-122907.)

Getting this all correct would probably take a fair amount of effort. Perhaps the big question is would it be worth addressing all these cases?

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

检查 Python/import.c、Python/importdl.c、Include/internal/pycore_importdl.h、Include/internal/pycore_import.h、Lib/importlib/_bootstrap_external.py 和 Objects/moduleobject.c 中指定的动态加载路径，以及列出的 Tools/build 脚本和 Modules/Setup.stdlib。在考虑 gh-122907 的情况下，比较未设置 HAVE_DYNAMIC_LOADING 时的行为，并在定义一致排除动态模块 API 和功能意味着什么之前，确定完整范围。