cc/gcc: Set CXX_FOR_BUILD for bare metal and canadian build.

>From 4.8, g++ is used as the default compiler to build the toolchain.

Signed-off-by: Zhenqiang Chen <zhenqiang.chen@linaro.org>
Message-Id: <CACgzC7B-LQvAw3hOYhBA7b7g0H1WtH20gqXM=Y=YFO4FrnZKWQ@mail.gmail.com>
Patchwork-Id: 243590

 # Compute sparc-specific values

 CT_DoArchTupleValues() {

     # That's the only thing to override

     if [ "${CT_ARCH_64}" = "y" ]; then

         CT_TARGET_ARCH="sparc64${CT_ARCH_SUFFIX}"

     fi

 }