Only import speedcopy on Win > 7 (#3581)
Only import speedcopy on Win > 7 (#3581)

* system: Only import speedcopy for Windows > 7

Fixes #3259

* Allow for Win 8

Co-authored-by: Charles Baynham <1170f1cee19811d2b21cc4dbdfa1821c4ddc7089@npl.co.uk>
efiop/dvc,efiop/dvc,dmpetrov/dataversioncontrol,dmpetrov/dataversioncontrol