8512 libstand won't build with GCC 7.1

@@ -9,11 +9,11 @@
 # http://www.illumos.org/license/CDDL.
 #
 
 #
 # Copyright 2016 Toomas Soome <tsoome@me.com>
-# Copyright 2016 RackTop Systems.
+# Copyright 2017 RackTop Systems.
 #
 
 include $(SRC)/Makefile.master
 
 AS=     $(GNU_ROOT)/bin/gas

@@ -56,10 +56,13 @@
 $(OBJS): machine x86
 
 %.o:    $(LIBSTAND_SRC)/%.c
         $(COMPILE.c) $<
 
+%.o:    $(LIB_BASE)/builtins/%.c
+        $(COMPILE.c) $<
+
 %.o:    $(LIB_BASE)/libc/net/%.c
         $(COMPILE.c) $<
 
 %.o:    $(LIB_BASE)/libc/string/%.c
         $(COMPILE.c) $<