* Fix already downloaded toolchain re-use
the following mv command would move $work into $toolchain_dir if the $toolchain_dir folder already existed.
* resolve z-fighting
two upstream LLVM bugs currently prevent building on some of the newest distros. There is no current LLVM release that works on them so we are pending fixes from LLVM
https://github.com/patchzyy/Wiicompiled/issues/136
theofficialgman