Added "\r" to WHITESPACE char for windows build.

[coskunergan]

see: #68

[d3zd3z]

A few minor issues, just with the commit text:

1. The commit needs to be signed off by. This is inherited from the Zephyr project, although we should probably come up with guidelines for this project.
2. There should be a bit more description in the commit text. Linking to the GH issue is fine (although just Fixes: #66 is better, as it will auto-fix when this merges).
3. There should be a short tag in front of the title. Something like "zephyr-build: " is fine.
4. Lastly, even more minor, the commit text should be in the present tense. Using the past tense probably feels a little more natural when writing, but the commits persist, and are generally read in the context of history.

What I'd suggest is something like:

zephyr-build: fix DTS parser for Windows

The zephyr-build DTS parser fails on Windows, due to the "\r\n" whitespace
used on that platform. Accept the "\r" in addition to the "\n" to allow it to
parse successfully.

Fixes: #66

Signed-off-by: Firstname Lastname <coskungeran@gmail>

I could update this for you if you'd prefer, but I do need to know what fullname to use.

[d3zd3z]

This definitely will work, although I think technically it should be "\r\n" and "\n", but this solution will also allow this to run on ancient Macs as well.

[d3zd3z]

CI issue with docs is unrelated.