[patch] Split openFileForWrite into windows and unix versions

[Rafael Espíndola]

> * I added the test for F_Binary, and it changes the output of (for
> example) llc to use windows format. It would be really nice to add a
> test for it. Any suggestion how to check for Carriage return in the
> output?

I just added a unittest.

Cheers,
Rafel
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