Correctly re-process non-option cmdline args on sighup
Whenever we had an non-option commandline arguments *and* option-bearing commandline arguments on the commandline, we would save only the latter across invocations of options_init_from_torrc, but take their existence as license not to re-parse the former. Yuck! Incidentally, this fix lets us throw away the backup_arg[gv] logic. Fix for bug 9746; bugfix on d98dfb37, not in any released Tor. Found by Damian. Thanks, Damian!