pcp.spec.in: make dependency version explicit for export-zabbix-agent
pcp.spec.in: make dependency version explicit for export-zabbix-agent

export-zabbix-agent has been changed elsewhere to be version explicit
for pcp-libs (not >=).  Change this in pcp.spec.in as well.

wuliming/pcp,adfernandes/pcp,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp,wuliming/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,adfernandes/pcp,wuliming/pcp,wuliming/pcp,wuliming/pcp