Let's properly get the default target for objcopy

This should make porting slightly easier and this should be able to
compile on 32 bit machines (but I don't have any so I can't test it).
Also let's just stript all the unneeded symbols from these files, it
is not like you're going to debug them or anything anyway..

Signed-off-by: Toon Schoenmakers <nighteyes1993@gmail.com>