Std-Canonicalized windows paths don't work

[nico-abram]

std's canonicalize generates verbatim paths on windows.

glob currently returns an empty vec for all verbatim paths: https://github.com/rust-lang-nursery/glob/blob/337d417ee872dc04e8e6faff4b7379141933df59/src/lib.rs#L223-L234

But I don't think there' a reason it can't handle VerbatimDisk paths, which should fix the majority of normal canonicalized paths. See pacak/cargo-show-asm#1 for an example of a problem caused by this.