Update toolchain and script

update to binutils 2.23.1, newlib 1.20.0, gcc 4.6.3, gcc linaro 4.6-2012.11, gdb 7.5.1, gdb linaro 7.5-2012.09, openocd 0.6.1
Toolchain built on Debian 6.0 for Linaro GCC and FSF GCC.
arm7tdmi multilib support is not actived.