classes/insane.bbclass: Do not follow links, fix the issue that made koen add bb...

classes/insane.bbclass: Do not follow links, fix the issue that made koen add bb.fatal
    udev has a link to host binaries, do not check the architecture
    of these binaries. We will skip all links for now for the two
    reasons:
        -We either point to a file in our package and then we will
         check it anyway
        -It is a file for a another package, which will be checked
         anyway
    Make architecture mismatch a fatal/insane error and return False.
    This should fix the issue koen has seen when he added a bb.fatal
    the make_fatal_error method returns true if the error should be
    made fatal, in this case our checks need to set sane to False.
    The return not makes sure this is happening.