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

 diff -urN uClibc-0.9.33.2~orig/Rules.mak uClibc-0.9.33.2/Rules.mak

 --- uClibc-0.9.33.2~orig/Rules.mak	2012-05-15 09:20:09.000000000 +0200

 +++ uClibc-0.9.33.2/Rules.mak	2012-09-24 14:09:51.092953729 +0200

 @@ -226,6 +226,7 @@

  OPTIMIZATION:=

  # Use '-Os' optimization if available, else use -O2, allow Config to override

 +ifneq ($(TARGET_ARCH),m68k)

  $(eval $(call check-gcc-var,-Os))

  ifneq ($(CFLAG_-Os),)

  OPTIMIZATION += $(CFLAG_-Os)

 @@ -233,6 +234,7 @@

  $(eval $(call check-gcc-var,-O2))

  OPTIMIZATION += $(CFLAG_-O2)

  endif

 +endif

  # Use the gcc 3.4 -funit-at-a-time optimization when available

  $(eval $(call check-gcc-var,-funit-at-a-time))

  OPTIMIZATION += $(CFLAG_-funit-at-a-time)