Updates sysroots for binary toolchain

[Zhenqiang Chen]

> In some ways it should.  The binary toolchain has the multiarch
> patches and should use the same search path.  Should the sysroot
> contain libgcc and libstdc++ at all?
>

The sysroot contain libgcc and libstdc++. But they are not in the
search path. In the sysroot, they are at:
/lib/arm-linux-gnueabi/libgcc_s.so.1
/usr/lib/gcc/arm-linux-gnueabi/4.6/libgcc_s.so
/usr/lib/gcc/arm-linux-gnueabi/4.6.1/libgcc_s.so

But the binary toolchain expects
/lib/libgcc_s.so
/lib/libgcc_s.so.1


-Zhenqiang