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

 CT_LOCAL_TARBALLS_DIR="${HOME}/src"

 CT_SAVE_TARBALLS=y

 CT_LOG_EXTRA=y

 CT_ARCH_ARCH="pentium-mmx"

 CT_ARCH_x86=y

 CT_TARGET_VENDOR="geode"

 CT_KERNEL_linux=y

 CT_KERNEL_V_2_6_36=y

 CT_BINUTILS_V_2_20_1a=y

 CT_BINUTILS_FOR_TARGET=y

 CT_CC_V_4_4_5=y

 CT_CC_LANG_FORTRAN=y

 CT_CC_LANG_CXX=y

 CT_CC_LANG_JAVA=y

 CT_LIBC_uClibc=y

 CT_LIBC_UCLIBC_V_0_9_30_2=y

 CT_LIBC_UCLIBC_CONFIG_FILE="${CT_LIB_DIR}/samples/${CT_TARGET}/${CT_LIBC}-${CT_LIBC_VERSION}.config"

 CT_DEBUG_dmalloc=y

 CT_DEBUG_duma=y

 CT_DEBUG_gdb=y

 CT_GDB_NATIVE=y

 CT_GDB_V_6_8a=y

 CT_DEBUG_ltrace=y

 CT_DEBUG_strace=y

 CT_STRACE_V_4_5_19=y

 CT_GMP_V_4_3_2=y

 CT_MPFR_V_2_4_2=y

 CT_PPL_V_0_10_2=y

 CT_CLOOG_V_0_15_9=y