Make sure rpath gets added for ostree libs

We bundle ostree in the package, so we need to make sure an rpath
gets set pointing to our bundled library.

The Makefiles are missing the OSTREE_LIBS (and so the -Wl,-rpath),
so add them in.
diff --git a/document-portal/Makefile.am.inc b/document-portal/Makefile.am.inc
--- a/document-portal/Makefile.am.inc	2017-11-08 16:52:40.135530435 -0500
+++ b/document-portal/Makefile.am.inc	2017-11-08 16:52:53.340379677 -0500
@@ -34,5 +34,5 @@ xdg_document_portal_SOURCES = \
 	document-portal/xdp-fuse.c		\
 	$(NULL)
 
-xdg_document_portal_LDADD = $(BASE_LIBS) $(FUSE_LIBS) libflatpak-common.la
+xdg_document_portal_LDADD = $(BASE_LIBS) $(FUSE_LIBS) $(OSTREE_LIBS) libflatpak-common.la
 xdg_document_portal_CFLAGS = $(BASE_CFLAGS) $(OSTREE_CFLAGS) $(SOUP_CFLAGS) $(JSON_CFLAGS) $(FUSE_CFLAGS) -I$(srcdir)/document-portal -I$(builddir)/document-portal -I$(srcdir)/permission-store -I$(builddir)/permission-store -DFLATPAK_COMPILATION
diff --git a/permission-store/Makefile.am.inc b/permission-store/Makefile.am.inc
--- a/permission-store/Makefile.am.inc	2017-11-09 14:34:13.681220097 -0500
+++ b/permission-store/Makefile.am.inc	2017-11-09 14:34:20.578146811 -0500
@@ -30,5 +30,5 @@ xdg_permission_store_SOURCES = \
 	permission-store/xdg-permission-store.h	\
 	$(NULL)
 
-xdg_permission_store_LDADD = $(BASE_LIBS) libflatpak-common.la
+xdg_permission_store_LDADD = $(BASE_LIBS) $(OSTREE_LIBS) libflatpak-common.la
 xdg_permission_store_CFLAGS = $(BASE_CFLAGS) $(SOUP_CFLAGS) $(JSON_CFLAGS) $(OSTREE_CFLAGS) $(GSYSTEM_CFLAGS) -I$(srcdir)/permission-store -I$(builddir)/permission-store
diff --git a/session-helper/Makefile.am.inc b/session-helper/Makefile.am.inc
--- a/session-helper/Makefile.am.inc	2017-11-09 14:34:47.849857022 -0500
+++ b/session-helper/Makefile.am.inc	2017-11-09 14:35:01.377713286 -0500
@@ -12,5 +12,5 @@ flatpak_session_helper_SOURCES = \
 	session-helper/flatpak-session-helper.c	\
 	$(NULL)
 
-flatpak_session_helper_LDADD = $(BASE_LIBS) libflatpak-common.la
+flatpak_session_helper_LDADD = $(BASE_LIBS) $(OSTREE_LIBS) libflatpak-common.la
 flatpak_session_helper_CFLAGS = $(BASE_CFLAGS) $(SOUP_CFLAGS) $(OSTREE_CFLAGS) $(GSYSTEM_CFLAGS) $(JSON_CFLAGS)