clean("c:/temp/..") results in "c:", not "c:/"

[vivainio]

You would expect "c:/temp/.." to be normalized to "c:/", but it results in "c:". "c:" does not mean the root of windows file system, but rather current directory in drive c:.

    let buf = clean("c:/temp/..");
    assert_eq!(buf, "c:");

[danreeves]

fixed in 1353191