Another fix from Johan Bergstr?m, using the gnu/dammit version of sort on the host can be screwed up by more than one environment variable.
Old compilers complain about linker options passed with -c, so split out $LDOPTIMIZE.
Give a hint when setuid logic fails.

Toybox expects to be setuid root; setuid some other user confuses the attempt to drop privileges, and we err on the side of avoiding shenanigans.
Next mount checkpoint.

Testing level: It compiled. If any portion of this works, I'll be amazed.

Still a bunch of todo items (see giant TODO block after globals)