[GS-5952] Add a note for OL9 users to install libxcrypt library is only required for GraalPy native standalone.

PullRequest: graalpython/3295

Author: olyagpl

docs/user/Python-Runtime.md

@@ -89,6 +89,8 @@ Alternatively, you can download a compressed GraalPy installation file from [Git
 1. Find the download that matches the pattern _graalpy-XX.Y.Z-linux-amd64.tar.gz_ or _graalpy-XX.Y.Z-linux-aarch64.tar.gz_ (depending on your platform) and download.
 2. Uncompress the file and update your `PATH` environment variable to include to the _graalpy-XX.Y.Z-linux-amd64/bin_ (or _graalpy-XX.Y.Z-linux-aarch64/bin_) directory.
 
+> Note: On Oracle Linux 9, additionally install the [`libxcrypt` library](https://github.com/besser82/libxcrypt) that is required for the GraalPy native runtime: `yum install libxcrypt-compat`.
+
 ### macOS
 
 The easiest way to install GraalPy on macOS is to use [Pyenv](https://github.com/pyenv/pyenv) (the Python version manager).