Add top-level/overrides.nix for package overrides#39515

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matthewbauer wants to merge 108 commits intoNixOS:stagingfrom

matthewbauer:default-overrides

Commits on Feb 20, 2018

Commits on Feb 21, 2018

Commits on Feb 28, 2018

thin-provisioning-tools: 0.6.3 -> 0.7.5
ryantm
committed

Commits on Apr 13, 2018

Commits on Apr 20, 2018

xpra: 2.2.5 -> 2.2.6
R. RyanTM
committed
matrix-synapse: 0.27.2 -> 0.27.4
florianjacob
committed
canonicaljson: 1.0.0 -> 1.1.3
florianjacob
committed

Commits on Apr 24, 2018

Commits on Apr 25, 2018