Rebuild the 4.4.3 toolchain on a OS X 10.7.5 macbook air because the one...

I recently needed to get back to building B2G on my macbook air, and so updated my b2g-toolchain-prebuilt checkout to your latest code. Unfortunately the apple-darwin binaries didn't run at all, they all crashed on startup with "Illegal instruction: 4" output. I've had this problem before with Jim Chen's jimdb binaries as well, so maybe it's something specific to my configuration, I don't know. But anyway I rebuilt the toolchain binaries using the build.sh script and it works fine. Here are the updated binaries that I built. You might want to add them as another branch on your repo although I don't know if I would merge them to master without checking that they don't break things for anybody else.