Add a simple deprecation message to warn users that macOS pre-compiled
dependencies are no longer provided starting with 5.0, and that they
should either build the libraries themselves or downgrade to 4.5.
This is what the warning looks like in context:
```
$ make update
git lfs install --skip-repo
Git LFS initialized.
Configuring Precompiled Libraries
=================================
Detected platform : macos
Detected architecture : x64
Updating Libraries
==================
* Skipping lib/linux_x64
* Skipping lib/macos_arm64
* Skipping lib/windows_x64
* Skipping lib/windows_arm64
Update finished with the following messages
===========================================
Blender repository skipped: you have unstaged changes
WARNING: macOS x64/Intel support was dropped in Blender 5.0.
As such, pre-compiled dependencies are no longer provided.
You may build the dependencies yourself, or downgrade to Blender 4.5.
For more details, please see: https://devtalk.blender.org/t/38835
```
Pull Request: https://projects.blender.org/blender/blender/pulls/143133
9d993b4f74