lib: move compat links from targetdirs to proper makefiles

@@ -13,6 +13,6 @@
 # Copyright 2015 Joyent, Inc.
 #
 
 include ../Makefile.com
 
-install: all $(ROOTLIBS) $(ROOTLINKS)
+install: all $(ROOTLIBS) $(ROOTLINKS) $(ROOTCOMPATLINKS)