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 sh-specific values

 CT_DoArchTupleValues () {

     # The architecture part of the tuple:

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

     # gcc ./configure flags

     CT_ARCH_WITH_ARCH=

     CT_ARCH_WITH_ABI=

     CT_ARCH_WITH_CPU=

     CT_ARCH_WITH_TUNE=

     CT_ARCH_WITH_FPU=

     CT_ARCH_WITH_FLOAT=

     # Endianness stuff

     case "${CT_ARCH_ENDIAN}" in

         big)    CT_ARCH_ENDIAN_CFLAG=-mb;;

         little) CT_ARCH_ENDIAN_CFLAG=-ml;;

     esac

     # CFLAGS

     case "${CT_ARCH_SH_VARIANT}" in

         sh3)    CT_ARCH_ARCH_CFLAG=-m3;;

         sh4*)

             # softfp is not possible for SuperH, no need to test for it.

             case "${CT_ARCH_FLOAT}" in

                 hard)

                     CT_ARCH_ARCH_CFLAG="-m4${CT_ARCH_SH_VARIANT##sh?}"

                     ;;

                 soft)

                     CT_ARCH_ARCH_CFLAG="-m4${CT_ARCH_SH_VARIANT##sh?}-nofpu"

                     ;;

             esac

             ;;

     esac

     CT_ARCH_FLOAT_CFLAG=

 }