lib: move compat links from targetdirs to proper makefiles

@@ -81,7 +81,10 @@
         $(POST_PROCESS_O)
 
 $(DYNLINKLIBDIR)/%: %$(VERS)
         $(INS.liblink)
 
+$(ROOTCOMPATLINKS):
+        $(RM) $@; $(SYMLINK) $(COMPATLINKTARGET) $@
+
 clean:
         $(RM) $(POBJS) $(OBJS) $(PICS) $(CLEANFILES)