[Toybox] Finally removed the python requirement.

[Rob Landley]

Now generated/help.h is made by a C file, every build, and I don't have 
to treat that file specially during clean or cutting release tarballs, 
and no weird python2 version probing. Yay!

Now I'm chipping away at the long-threatened usage: line collation for 
dependent help entries, then I can get back to finishing the ifconfig 
section of the cleanup page, poking at mount...

Rob