• Bug 1621371 - Update servo-fontconfig-sys to avoid intermittent build… 

    … errors. r=kvark

The lack of servo/libfontconfig#42 in 4.0.4
broke rust CI

Differential Revision: https://phabricator.services.mozilla.com/D66275

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/399aeed6f2c4f1e4300b3a11ee740464e0e0d5c3
    @jrmuizel @moz-gfx
    jrmuizel authored and moz-gfx committed Mar 11, 2020
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    07439c5