[bug#27958] [fonts] Add font-fira-sans

[ng0]

This is not the canonical upstream source. But the upstream
source bundles many pdf files (one for each variant I assume) and
has a layout which makes it impossible to use our font-build-system.

Mozilla (where the upstream team works with), size: 90.2MiB
Upstream: 96.6MiB

Is it still acceptable for us to use github in this case?

Upstream source is https://carrois.com/typefaces/FiraSans/#!layout=editor
in case anyone wants to take a look.

The appended patch uses the github of mozilla as source.
-- 
ng0
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0001-gnu-add-font-fira-sans.patch
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