build: simplify rpm dependencies on pcp-webjs package
build: simplify rpm dependencies on pcp-webjs package

Update upstream location of pcp-webjs source archive in
the fedora spec, based on advice from lberk.

Use an rpm feature of allowing a single directory to be
installed by multiple packages to remove pcp-webapi dep
from pcp-webjs (recently added for RHBZ #1208699).

$ rpm -qf /usr/share/pcp/webapps
pcp-webapi-3.10.4-1.fc21.x86_64
pcp-webjs-3.10.4-1.fc21.noarch

Thanks fche for the tip - this is a definitely neater.

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