autotools: test for pkg-config

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10922 ddefafc4-47db-0310-ae44-fa13212b10f2
repro: pyroute: pass extension headers to plugin

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10923 ddefafc4-47db-0310-ae44-fa13212b10f2
repro: pyroute: do not parse body, pass content-type header

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10924 ddefafc4-47db-0310-ae44-fa13212b10f2
repro: CookieAuthenticator: checking extension header against cookie

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10925 ddefafc4-47db-0310-ae44-fa13212b10f2
release: Update for 1.9.0~rc2

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10926 ddefafc4-47db-0310-ae44-fa13212b10f2