build/rpm/pcp.spec.in: make some more Requires clauses conditional
build/rpm/pcp.spec.in: make some more Requires clauses conditional

RH and SUSE cannot agree on the rpm package names for some
more things ... libpfm or libpfm4 and python3-jsonpointer
or python-jsonpointer for python3.

adfernandes/pcp,adfernandes/pcp,prasincs/pcp,wuliming/pcp,aeg-aeg/pcpfans,prasincs/pcp,wuliming/pcp,aeg-aeg/pcpfans,aeg-aeg/pcpfans,wuliming/pcp,edwardt/pcp,aeg-aeg/pcpfans,wuliming/pcp,adfernandes/pcp,tjanez/pcp,aeg-aeg/pcpfans,edwardt/pcp,tjanez/pcp,prasincs/pcp,tjanez/pcp,prasincs/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,tjanez/pcp,adfernandes/pcp,prasincs/pcp,edwardt/pcp,edwardt/pcp,prasincs/pcp,prasincs/pcp,tjanez/pcp,aeg-aeg/pcpfans,adfernandes/pcp,adfernandes/pcp,tjanez/pcp,prasincs/pcp,wuliming/pcp,wuliming/pcp,edwardt/pcp,edwardt/pcp,tjanez/pcp,aeg-aeg/pcpfans,aeg-aeg/pcpfans,edwardt/pcp,edwardt/pcp,tjanez/pcp