Canonicalize file paths from walker

[ajpaverd]

On Windows 10, the tool does not count files that are actually used in the build, due to a mismatch in the file path representations.

For example, cargo geiger -v gives:

Used by build (sorted): \\?\C:\Users\ajpaverd\rust0\src\main.rs
Metric output format: x/y
x = unsafe code used by the build
y = total unsafe code found in the crate
Functions  Expressions  Impls  Traits  Methods  Dependency
Not used in build: C:\Users\ajpaverd\rust0\src\main.rs
0/1        0/1          0/0    0/0     0/0        rust0 v0.1.0 (file:///C:/Users/ajpaverd/rust0)
WARNING: Dependency file was never scanned: \\?\C:\Users\ajpaverd\rust0\src\main.rs

I've tested the fixed version on:

• Windows 10
• Windows Subsystem for Linux (Ubuntu 18.04)
• Ubuntu 18.04

I think the fix is quite simple, but please let me know if anything needs to be changed. Thanks!

[anderejd]

Excellent, thanks!

I'll test and merge it later today.

[anderejd]

Wow, this project hasn't been working at all on Windows for quite a while. I really need to add #36

Thank you again!

Merging.

[anderejd]

This bugfix has been released as part of 0.4.2.