[Buildroot] AVR32 toolchain reinstated

[Ulf Samuelsson]

The AVR32 external source toolchain seems to work again
using the gcc-4.2.2 compiler with patches from
www.atmel.no/buildroot (revision 2.2.0-rc4).

After a small fix in libdaemon where libtoolize seems to
replace the recently copied config.* from package/gnuconfig,
the build of the atngw100 completes generating a linux,
jffs2 and tar file systems, as well as u-boot.bin

Best Regards
Ulf Samuelsson