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build: add Meson wrap manifests for our dependencies

Simon Ser requested to merge emersion/wlroots:wraps into master

Add Meson wrap manifests for all of our dependencies which can fallback to a subproject. This makes it easier to build wlroots on platforms where system packages are outdated. Users can now opt-in via meson configure --wrap-mode=default and Meson will download and build any missing dependency.

Don't download by default because this can be quite surprising and undesirable for some users (e.g. if they are just missing some -dev package).

A downside is that wrap files are automatically inherited by parent projects (compositors), even if wlroots has wrap_mode=nodownload. This means all compositors will need to explicitly set wrap_mode=nodownload if they want to prevent the auto-download-by-default behavior. There is no way to avoid this AFAIK.

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