Remove P flag from getopt.
Remove P flag from getopt.

This used to mean "parasitic", but has been removed a long time ago.

dtaht/babeld-shortrtt-metrics,boutier/babeld,jech/babeld,woniullb/babeld,jech/babeld,wlanslovenija/babeld,wlanslovenija/babeld,tcatm/babeld,Gwendocg/babeldToS,sudomesh/babeld,Drooids/babeld,Gwendocg/babeldToS