Auto merge of #3189 - edunham:fix-empty-path-bug, r=alexcrichton
Auto merge of #3189 - edunham:fix-empty-path-bug, r=alexcrichton

Make it possible for windows-gnu tests to pass

Skip test that uses empty path on Windows, because Windows doesn't do the empty path thing.

eminence/cargo,AndiDog/cargo,sbeckeriv/cargo,nipunn1313/cargo,tsurai/cargo,achanda/cargo,nipunn1313/cargo,tshepang/cargo,tsurai/cargo,rustyhorde/cargo,achanda/cargo,rust-lang/cargo,durka/cargo,tshepang/cargo,tshepang/cargo,rustyhorde/cargo,tsurai/cargo,vojtechkral/cargo,vojtechkral/cargo,achanda/cargo,durka/cargo,durka/cargo,eminence/cargo,AndiDog/cargo,rust-lang/cargo,AndiDog/cargo,vojtechkral/cargo,durka/cargo,AndiDog/cargo,sbeckeriv/cargo,tsurai/cargo,vojtechkral/cargo,eminence/cargo,nipunn1313/cargo,AndiDog/cargo,nipunn1313/cargo,eminence/cargo,achanda/cargo,sbeckeriv/cargo,rust-lang/cargo,sbeckeriv/cargo,rustyhorde/cargo,tsurai/cargo,rustyhorde/cargo,tshepang/cargo,rust-lang/cargo