configure.in update for handling latest Fedora defaults.
configure.in update for handling latest Fedora defaults.

Rodney McKee reports his recent Fedora upgrade fails to build
PCP thanks to the configure script not finding init.  systemd
appears to be the default there now, so this should fix it.

adfernandes/pcp,aeg-aeg/pcpfans,mbaldessari/pcp,adfernandes/pcp,mbaldessari/pcp,prasincs/pcp,ryandoyle/pcp_original,tjanez/pcp,edwardt/pcp,aeg-aeg/pcpfans,wuliming/pcp,adfernandes/pcp,prasincs/pcp,edwardt/pcp,andyvand/cygpcpfans,tjanez/pcp,edwardt/pcp,edwardt/pcp,tjanez/pcp,andyvand/cygpcpfans,mbaldessari/pcp,mbaldessari/pcp,edwardt/pcp,wuliming/pcp,wuliming/pcp,ryandoyle/pcp_original,tjanez/pcp,tjanez/pcp,andyvand/cygpcpfans,edwardt/pcp,aeg-aeg/pcpfans,mbaldessari/pcp,wuliming/pcp,edwardt/pcp,adfernandes/pcp,andyvand/cygpcpfans,aeg-aeg/pcpfans,tjanez/pcp,prasincs/pcp,prasincs/pcp,prasincs/pcp,tjanez/pcp,adfernandes/pcp,tjanez/pcp,prasincs/pcp,adfernandes/pcp,adfernandes/pcp,wuliming/pcp,mbaldessari/pcp,aeg-aeg/pcpfans,edwardt/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,ryandoyle/pcp_original,wuliming/pcp,ryandoyle/pcp_original,aeg-aeg/pcpfans,wuliming/pcp,adfernandes/pcp,aeg-aeg/pcpfans,ryandoyle/pcp_original,prasincs/pcp,ryandoyle/pcp_original,wuliming/pcp,ryandoyle/pcp_original,andyvand/cygpcpfans,ryandoyle/pcp_original,andyvand/cygpcpfans,andyvand/cygpcpfans,prasincs/pcp