Add new target: vxworks for xscale

[Richard Kenner]

    Given what you have said, and given how very broken the patch was, I
    can only conclude you did not test it beyond "yup, it compiles."  For
    instance, any program that used exception handling would have gotten
    loader errors when actually run on VxWorks.

No, I didn't test it, instead taking it for granted that the submitter did.
I only test patches to make sure they don't break mainline targets, assuming
that the submitter verified they do as they are supposed to.  Indeed I'm
quite surprised it worked on his configuration but not on yours.

It was partly your comment about loader errors that motivated me to get
Olivier involved since it seems like there are different configurations
involved.