Bug 1054043 - Remove wrapcommand. r=ted

This code was only needed on 10.5, and the versio string compare
fails now that there's a 10.10.
Bug 1054043 - Remove 32 bit cmd wapper from mozrunner. r=ahal

We no longer support MacOS 10.5 and the version string compare
fails on 10.10. Unbreaks running the mochitests there.