Right, that's it! Nuke rawSystem nonsense, as it turns
out the SysTools replacement for it wasn't 4.08 compatible,
hence nightly build break.

Should you bootstrap with 4.08 under mingw, and subseq.
do a stage2 build, you'll run into command-line length
probs during the final big linker invocation. Nothing
to lose sleep over, there are plenty of newer versions
to base a stage1 build on.