arch/powerpc: add powerpc64le support

Technically, I don't forbid powerpcle support either, but I'm not sure that
there is any library/compiler support for that at the moment (though the hw
technically makes it possible).

powerpc64le needs glibc 2.19 and gcc 4.9. I haven't looked into the support
tools, but at least gdb 7.5 is too old (7.7.1 definitely has support).

Also make powerpc64 non-experimental. It's practically old at this point.

Signed-off-by: Cody P Schafer <dev@codyps.com>
[yann.morin.1998@free.fr: use ${target_endian_le} and ${target_bits_64}]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Message-Id: <64bfbbced9dd8f62e0d6.1399801945@gun>
Patchwork-Id: 347775

CT_EXPERIMENTAL=y

CT_LOCAL_TARBALLS_DIR="${HOME}/src"

CT_SAVE_TARBALLS=y

CT_LOG_EXTRA=y

CT_ARCH_ARCH="armv6zk"

CT_ARCH_CPU="arm1176jzf-s"

CT_ARCH_TUNE="arm1176jzf-s"

CT_ARCH_FPU="vfp"

CT_ARCH_arm=y

CT_ARCH_SUFFIX="v6"

CT_TARGET_VENDOR="rpi"

CT_KERNEL_linux=y

CT_KERNEL_V_3_6=y

CT_BINUTILS_V_2_22=y

CT_BINUTILS_LINKER_LD_GOLD=y

CT_BINUTILS_GOLD_THREADS=y

CT_BINUTILS_LD_WRAPPER=y

CT_BINUTILS_PLUGINS=y

CT_CC_GCC_SHOW_LINARO=y

CT_CC_LANG_CXX=y

# CT_CC_STATIC_LIBSTDCXX is not set

CT_CC_GCC_DISABLE_PCH=y

CT_CC_GCC_BUILD_ID=y

CT_CC_GCC_LNK_HASH_STYLE_BOTH=y

CT_LIBC_EGLIBC_V_2_16=y

CT_EGLIBC_OPT_SIZE=y

CT_LIBC_GLIBC_KERNEL_VERSION_CHOSEN=y

CT_LIBC_GLIBC_MIN_KERNEL_VERSION="3.2.27"