[Buildroot] binutils doesn't like -elf2flt option

[Adam Nielsen]

>> $ python2 ../../../buildroot/support/scripts/graph-depends > dep.dot
>
> This one is correct.

Great, thanks!

>> Getting targets
>> Getting dependencies for ['elf2flt', 'ncurses', 'zlib', 'nano', 'busybox',
>> 'linux', 'rootfs-romfs', 'rootfs-tar', 'rootfs-cpio', 'rootfs-initramfs',
>> 'rootfs-squashfs']
>> Error getting dependencies ['elf2flt', 'ncurses', 'zlib', 'nano', 'busybox',
>> 'linux', 'rootfs-romfs', 'rootfs-tar', 'rootfs-cpio', 'rootfs-initramfs',
>> 'rootfs-squashfs']
>>
>> So I'm not sure whether I need to do something differently?
>
> What does the output PDF looks like?

I can't generate the PDF, the dep.dot file is zero bytes.  I'm guessing 
graph-depends gives up when it reports that error message.

Thanks,
Adam.