I do not know of a need to have the default shell be a build-time
configurable setting. All *nix systems I am aware of have /bin/sh as a
default posix compatible shell.
If some systems running OpenRC do not make that assumption about
/bin/sh, I will consider bringing this back, so feel free to open an
issue.
This makes the halt wrapper sysvinit compatible. It ignores several
command line switches which are not currently implemented; however,
those can be implemented if we need to do so.
This fixes https://github.com/openrc/openrc/issues/146.