[PATCH] allow device specification to be a symlink

[Nick Black]

Aleksander Morgado left as an exercise for the reader:
> It is monitored, let's discuss there.

As requested, I created https://gitlab.freedesktop.org/mobile-broadband/libqmi/merge_requests/23
after implementing the change requested by Dan Williams.

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to make an apple pie from scratch, you need first invent a universe.