- Fix USE_RC_SUBR to use bb{ackup,store}d.sh.in
- Rename files/bb{ackup,store}d.sh as above to .sh.in, add appropriate
substitutions
- Add SHA256
- OPTIONSify
- Some general reorganisation and cleanup of whitespace
PR: ports/90166
Submitted by: James O'Gorman <james@netinertia.co.uk> (maintainer)