binutils/binutils: CT_BINUTILS_GOLD_THREADED should be CT_BINUTILS_GOLD_THREADS

Signed-off-by: Zhenqiang Chen <zhenqiang.chen@linaro.org>
(transplanted from 712a8ed2276253b5534b2bc7e9b8da8c3648a36f)

 reporter_name="Remy Bohmer"

 reporter_url="linux@bohmer.net"

 reporter_comment="Example for building a toolchain for m68000 bare metal targets"