arch/avr32: Fix download of header files

This patch fixes the download of the avr32 headers in crosstool-ng by
fetching them directly from Atmel's web site instead of the now-broken URL
given by the original author of the avr32-header-fetching modification,
who fetched them from a copy on his own, now-defunct server.

It also adds the necessary logic to extract from a zip file, as that is
how the headers are packaged.

To configure it for avr32 after launching ct-ng menuconfig in an empty
directory:

Paths and misc options ->
Shell to use as CONFIG_SHELL = sh
Target options ->
Target Architecture = avr32
Toolchain options ->
Tuple's alias = avr32
Binary utilities ->
binutils version = 2.18a
C compiler
gcc version = 4.2.2
C-library
newlib version = 1.17.0
Enable IOs on long long = yes
Enable IOs on floats and doubles = yes
Disable the syscalls supplied with newlib = yes

CONFIG_SHELL is necessary to get round the "fragment: command not
found" bug when binutils-2.18 is configured using bash.

Prepared against crosstool-ng mercurial trunk on 31 March 2012.

Signed-off-by: Martin Guy <martinwguy@gmail.com>
[yann.morin.1998@free.fr: update bundles sample accordingly]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Message-Id: <CAL4-wQrg_NQ7jm-NCADqeyQr9twyhtx42OUGNThP6gWeqZc=kw@mail.gmail.com>
Patchwork-Id: 232612

# Compute ARM-specific values

CT_DoArchTupleValues() {

    # The architecture part of the tuple:

    CT_TARGET_ARCH="${CT_ARCH}${CT_ARCH_SUFFIX:-${target_endian_eb}}"

    # The system part of the tuple:

    case "${CT_LIBC},${CT_ARCH_ARM_EABI}" in

        *glibc,y)   CT_TARGET_SYS=gnueabi;;

        uClibc,y)   CT_TARGET_SYS=uclibcgnueabi;;

        *,y)        CT_TARGET_SYS=eabi;;

    esac

    # Set the default instruction set mode

    case "${CT_ARCH_ARM_MODE}" in

        arm)    ;;

        thumb)

            CT_ARCH_CC_CORE_EXTRA_CONFIG="--with-mode=thumb"

            CT_ARCH_CC_EXTRA_CONFIG="--with-mode=thumb"

#            CT_ARCH_TARGET_CFLAGS="-mthumb"

            ;;

    esac

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

        CT_ARCH_TARGET_CFLAGS+=" -mthumb-interwork"

    fi

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

        CT_TARGET_SYS="${CT_TARGET_SYS}hf"

    fi

}