slic3r: Add ModuleBuild to BuildInputs, due to http://hydra.nixos.org/build/33298227/nixlog/1
(cherry picked from commit 29cf3ecd78166fa1affd6a8202080ceb0b6dfcd2)
Signed-off-by: Domen Kožar <domen@dev.si>
authored by Graham Christensen and committed by Domen Kožar edca6470 257e0f78