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 x86-specific values

# This one really needs a little love! :-(

CT_DoArchTupleValues() {

    # Override the architecture part of the tuple:

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

        CT_TARGET_ARCH=x86_64

    else

        arch="${CT_ARCH_ARCH}"

        [ -z "${arch}" ] && arch="${CT_ARCH_TUNE}"

        case "${arch}" in

            "")                           CT_TARGET_ARCH=i386;;

            i386|i486|i586|i686)          CT_TARGET_ARCH="${arch}";;

            winchip*)                     CT_TARGET_ARCH=i486;;

            pentium|pentium-mmx|c3*)      CT_TARGET_ARCH=i586;;

            pentiumpro|pentium*|athlon*)  CT_TARGET_ARCH=i686;;

            prescott)                     CT_TARGET_ARCH=i686;;

            *)                            CT_TARGET_ARCH=i586;;

        esac

    fi

    CT_TARGET_ARCH="${CT_TARGET_ARCH}${CT_ARCH_SUFFIX}"

}