sys/cmd/harden: don't unnecessarily add '--' to 'command'
sys/cmd/harden: don't unnecessarily add '--' to 'command'

lib/modernish/mod/sys/cmd/harden.mm:
- When hardening and tracing builtins, all the extra '--' is ugly
  in tracing output, so only add it in the unlikely case that the
  name of a builtin starts with '-' so we need to stop 'command'
  from processing it as an option. (With some shells supporting
  arbitrary loadable builtins, this is not impossible).

modernish/modernish