Fix files unit test for filesystems with Windows locking semantics
Fix files unit test for filesystems with Windows locking semantics

lukecheeseman/ponyta,malthe/ponyc,Perelandric/ponyc,CausalityLtd/ponyc,CausalityLtd/ponyc,Perelandric/ponyc,jupvfranco/ponyc,ryanai3/ponyc,mkfifo/ponyc,lukecheeseman/ponyta,sgebbie/ponyc,boemmels/ponyc,Perelandric/ponyc,ryanai3/ponyc,dipinhora/ponyc,kulibali/ponyc,malthe/ponyc,ponylang/ponyc,boemmels/ponyc,doublec/ponyc,Praetonus/ponyc,lukecheeseman/ponyta,doublec/ponyc,Theodus/ponyc,jupvfranco/ponyc,jupvfranco/ponyc,cquinn/ponyc,Theodus/ponyc,kulibali/ponyc,mkfifo/ponyc,kulibali/ponyc,boemmels/ponyc,mkfifo/ponyc,jemc/ponyc,CausalityLtd/ponyc,sgebbie/ponyc,boemmels/ponyc,boemmels/ponyc,mkfifo/ponyc,mkfifo/ponyc,sgebbie/ponyc,sgebbie/ponyc,dipinhora/ponyc,jemc/ponyc,Theodus/ponyc,Perelandric/ponyc,malthe/ponyc,sgebbie/ponyc,jupvfranco/ponyc,malthe/ponyc,Praetonus/ponyc,kulibali/ponyc,cquinn/ponyc,ponylang/ponyc,doublec/ponyc,Praetonus/ponyc,ponylang/ponyc,Theodus/ponyc,Perelandric/ponyc,cquinn/ponyc,cquinn/ponyc,Theodus/ponyc,jemc/ponyc,jupvfranco/ponyc,Praetonus/ponyc,dipinhora/ponyc,ryanai3/ponyc