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

 # Test suite config options

 if EXPERIMENTAL

 menu "Test suite"

 config TEST_SUITE

     bool

 config TEST_SUITE_GCC

     bool

     prompt "GCC test suite"

     depends on EXPERIMENTAL

     select TEST_SUITE

     help

       Select this option to install the GCC test suite in $CT_PREFIX_DIR/test_suite.

       The GCC test suite includes a collection of various toolchain tests for GCC -

       it utilizes the DejaGnu test framework.

       For some tests a network enabled target with ssh server is required.

       A helper Makefile is provided for running the tests - please see the included

       README for information on how to run the test suite.

 endmenu

 endif