pmb/qemu/run.py: Depending on removed package "mesa-dri-classic"

qemu-amd64 fails to start, complaining about missing package mesa-dri-classic.

This package was removed in Alpine Linux:

https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/31848

However, the script pmb/qemu/run.py still depends on it:

https://gitlab.postmarketos.org/postmarketos/pmbootstrap/-/blob/bd4a7d5d3f2c6fcdc7d42abeee1fd69d505db835/pmb/qemu/run.py#L280

Commenting out this line let's qemu-amd64 start.

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