Switch toolchain from gcc-4.4.0 to gcc-4.4.3

gcc-4.4.3 toolchain is based on fsf GCC-4.4.3 with numerous patches.
It reduces 3.65% code size than the prebuilt gcc-4.4.0 toolchain,
and improves 3.4% performance on Android benchmarks.

The toolchain uses gold as default linker. With gold, the toolchain
further reduces 1MB system image.

Change-Id: I55eb4df185f2932e71498fcc28428e4d1b175393