Fix some sed bugs and improve error reporting. A newline after 'b' commands in -e command line patterns was being discarded as whitespace, a single element regex match on a {} was leaving stale state for the next line, and giant -e blobs of instructions were saying things like problem at character 432 (note: nulls inserted for regex processing aren't always cleaned up, screws up error reporting).

syntax: glob
.config*
generated/
kconfig/mconf
kconfig/conf
toybox
toybox_unstripped