branches: 1.13.34; 1.13.42; 1.13.50; 1.13.52; 1.13.56; 1.13.58; 1.13.60; 1.13.62;
Add an _rc_subr_loaded variable, set to ":" by rc.subr. Scripts can use this
for a speedup by doing:
$_rc_subr_loaded . /etc/rc.subr