Update README.md (#834)

Mention that the `pugixml` system library can be used if found, but it's optional
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Jonathan Washington 2024-02-17 09:56:22 -05:00 committed by GitHub
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@ -29,6 +29,8 @@ sudo dnf install SDL2-devel freeimage-devel freetype-devel curl-devel \
vlc-devel rapidjson-devel
```
Optionaly, `pugixml` can be installed and used (Debian package: `libpugixml-dev`, Fedora/SuSE package: `pugixml-devel`), but EmulationStation can use its own included copy if not found.
**Note**: this repository uses a git submodule - to checkout the source and all submodules, use
```bash