the other way around...

Change-Id: I6aeaa95079e37e710e5b8b1b8ce24464e11f45bb
fix deps for projects using librevenge

Change-Id: Icc6e2465d96cc95b229a1f7abc6d51362ae3d016
always provide REDLAND_CFLAGS/LIBS to ext. projects

Change-Id: Iad1004503e91fbaf6251edc50b20d89ddbb15efa