Incorrect installation of `lib-dynload` for custom builds on openSUSE

Bug report

Bug description:

from Python-3.13.2.tar.xz

./configure --prefix=$RUN/python/3.13.2
make -j 16
make -j 4 install

dynamic libraries are installed to $RUN/3.13.2/lib64/python3.13/lib-dynload
but internally sys.path uses $RUN/3.13.2/lib/python3.13/lib-dynload

setting a link resolves the

errors that show up:

> python3
**Could not find platform dependent libraries <exec_prefix>**
Python 3.13.2 (main, Mar 18 2025, 10:25:05) [GCC 7.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
**warning: can't use pyrepl: No module named '_opcode'**

pip3 download pip wheel setuptools 
...
    from _posixsubprocess import fork_exec as _fork_exec
**ModuleNotFoundError: No module named '_posixsubprocess'**

CPython versions tested on:

3.13

Operating systems tested on:

Linux

在 Linux 上使用报告中的 ./configure、make 和 make install 命令重现自定义构建，然后检查已安装的 lib-dynload 路径与 sys.path 的差异。修复完成的标准是：无需符号链接即可找到 _opcode 和 _posixsubprocess 等扩展模块，并且 pip 可以成功运行。