binutils/binutils: simplify gold dependencies

In preparation of adding a new kernel-type, Yann D. came up
with a change in semantic on binutils/gold availability.

So far, it was architectures' responsibility to declare that
they did support binutils/gold or not. It makes much more sense
that binutils/gold declares its own availability depending on
the current architecture; after all, architectures have no way
to know wether gold supports them, while gold does know it.

Signed-off-by:Yann Diorcet <diorcet.yann@gmail.com>
[yann.morin.1998@free.fr: split up original patch for self-contained changes]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Message-Id: <d3d1d51f399e6d2c1163.1353320546@macbook-smorlat.local>
Patchwork-Id: 199971

# Build script for m4

CT_M4_VERSION=1.4.13

do_companion_tools_m4_get() {

    CT_GetFile "m4-${CT_M4_VERSION}" \

               {ftp,http}://ftp.gnu.org/gnu/m4

}

do_companion_tools_m4_extract() {

    CT_Extract "m4-${CT_M4_VERSION}"

    CT_Patch "m4" "${CT_M4_VERSION}"

}

do_companion_tools_m4_build() {

    CT_DoStep EXTRA "Installing m4"

    mkdir -p "${CT_BUILD_DIR}/build-m4"

    CT_Pushd "${CT_BUILD_DIR}/build-m4"

    CT_DoExecLog CFG \

    "${CT_SRC_DIR}/m4-${CT_M4_VERSION}/configure" \

        --prefix="${CT_BUILDTOOLS_PREFIX_DIR}"

    CT_DoExecLog ALL make

    CT_DoExecLog ALL make install

    CT_Popd

    CT_EndStep

}