rpm: fix DSO plugin install directory

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10931 ddefafc4-47db-0310-ae44-fa13212b10f2
repro: pyroute: build fixes for RHEL6

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10932 ddefafc4-47db-0310-ae44-fa13212b10f2
rpm: build pyroute plugin

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10933 ddefafc4-47db-0310-ae44-fa13212b10f2
rpm: update for v1.9.x series, tested on RHEL6

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10934 ddefafc4-47db-0310-ae44-fa13212b10f2
rpm: various fixes for RHEL6 builds (backported from main)

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@10935 ddefafc4-47db-0310-ae44-fa13212b10f2