Log Message:
Remove the binutils buildlink3.mk.

There has to be another way to specify it, if it is really needed.
Please ask Roland Illig if you get into problems with this commit, because
this is now necessary after rev 1.6 of pkgsrc/devel/binutils/builtin.mk
This stops installing a package which is not really needed, because the
binutils programs in the basesystem are good enough.