fix: fix build
fix: fix build

Summary: This Diff fixes the build on GitHub by adding the missing static instanciation.

Reviewed By: fabianschenk

Differential Revision: D26197676

fbshipit-source-id: 16d7baa7c0fa82175f6ada9055e222190371c775

mapillary/OpenSfM,mapillary/OpenSfM,mapillary/OpenSfM,oscarlorentzon/OpenSfM,mapillary/OpenSfM,oscarlorentzon/OpenSfM,oscarlorentzon/OpenSfM,oscarlorentzon/OpenSfM,mapillary/OpenSfM,oscarlorentzon/OpenSfM