support code after all). It also contains a patch from Larry Doolittle
that removes two instances of "strlen([^)]*) *- *1", un-shadows two
variables, relaxes requirement for a sprintf(3) that returns number of
bytes written, and eliminates a duplicate subroutine.
a few other ugly places (do_subst_command got a much-needed overhaul). Also
took out BB_FEATURE_SED_PATTERN_SPACE from Config.h[.Hurd] as the 'p' is now a
standard feature (adds almost no bloat).
