Fix bootstrap with older gcc version

[nick clifton]

Hi Kai,

> this patch fixes an uninitialized warning in objcopy.c file.

Doh!

> ChangeLog
> 2013-02-15  Kai Tietz
>
>          * objcopy.c (copy_main): Initialize context variable.
>
> Ok for apply?

Yes.  This definitely counts as an obvious fix by the way.

Cheers
   Nick