Cannot use pyenv-installed python due to missing library

On my system, I installed a version of python using pyenv. The version of python is compiled by pyenv from source against libraries in the system, as normal

Visual Studio code cannot find this version of python. Looking at the logs I see:

```
Error 2020-08-19 01:13:50: Failed to get interpreter information for '/home/valmar/.pyenv/versions/om-py3/bin/python3' [Error: Command failed: "/home/valmar/.pyenv/versions/om-py3/bin/python3" "/home/valmar/.var/app/com.visualstudio.code/data/vscode/extensions/ms-python.python-2020.8.101144/pythonFiles/pyvsc-run-isolated.py" "/home/valmar/.var/app/com.visualstudio.code/data/vscode/extensions/ms-python.python-2020.8.101144/pythonFiles/interpreterInfo.py"
/home/valmar/.pyenv/versions/om-py3/bin/python3: error while loading shared libraries: libcrypt.so.2: cannot open shared object file: No such file or directory
```

libcrypt is installed in my system, but no in the Flatpak. Pyenv is quite a commonly used program. Would it be possible please to install the library in the flatpak?

首先复现 issue 中所示的 pyenv 可执行文件的解释器发现过程，并检查 Flatpak 环境中的 libcrypt.so.2。完成的标准是 Visual Studio Code 能够从这个由 pyenv 安装的 Python 获取解释器信息，而不会出现缺少库的错误。

由索引模型根据 Issue 内容生成。