add possibly missing RPATH for zlib.

component/dbus/buildout.cfg

@@ -3,6 +3,7 @@ extends =
   ../libxml2/buildout.cfg
   ../pkgconfig/buildout.cfg
   ../libexpat/buildout.cfg
+  ../zlib/buildout.cfg
 
 parts =
   dbus
@@ -33,4 +34,4 @@ environment =
   PATH=${pkgconfig:location}/bin:${glib:location}/bin:%(PATH)s
   PKG_CONFIG_PATH=${dbus:location}/lib/pkgconfig:${glib:location}/lib/pkgconfig
   CPPFLAGS=-I${libexpat:location}/include
-  LDFLAGS=-L${libexpat:location}/lib -L${gettext:location}/lib
+  LDFLAGS=-L${libexpat:location}/lib -L${gettext:location}/lib -Wl,-rpath=${zlib:location}/lib