This fixes compilation with slibtool instead of GNU libtool

--- a/src/engine/Makefile.am
+++ b/src/engine/Makefile.am
@@ -152,6 +152,8 @@
 libfzclient_private_la_LDFLAGS += $(LIBFZSSH_LIBS) $(LIBFILEZILLA_LIBS)
 libfzclient_private_la_LDFLAGS += $(IDN_LIB)

+libfzclient_private_la_LIBADD = $(PUGIXML_LIBS)
+
 if FZ_MAC
 libfzclient_private_la_LDFLAGS += -framework CoreServices
 endif
--- a/src/interface/Makefile.am
+++ b/src/interface/Makefile.am
@@ -309,7 +309,7 @@

 if HAVE_DBUS
 filezilla_DEPENDENCIES += ../dbus/libfzdbus.a
-filezilla_LDFLAGS += ../dbus/libfzdbus.a $(LIBDBUS_LIBS)
+filezilla_LDADD = ../dbus/libfzdbus.a $(LIBDBUS_LIBS)
 endif

 filezilla_LDFLAGS += $(WX_LIBS)