8512 libstand won't build with GCC 7.1

@@ -9,10 +9,11 @@
 # http://www.illumos.org/license/CDDL.
 #
 
 #
 # Copyright 2016 Toomas Soome <tsoome@me.com>
+# Copyright 2017 RackTop Systems.
 #
 
 #
 # Notes:
 # - We don't use the libc strerror/sys_errlist because the string table is

@@ -31,10 +32,15 @@
 OBJS=   __main.o assert.o bcd.o environment.o \
         getopt.o gets.o globals.o pager.o printf.o \
         strdup.o strerror.o strtol.o strtoul.o random.o \
         sbrk.o twiddle.o zalloc.o zalloc_malloc.o
 
+# builtins provided by compiler-rt
+SRCS += $(LIB_BASE)/builtins/divmoddi4.c
+SRCS += $(LIB_BASE)/builtins/udivmoddi4.c
+OBJS += divmoddi4.o udivmoddi4.o
+
 # private (pruned) versions of libc string functions
 SRCS += $(LIBSTAND_SRC)/strcasecmp.c
 OBJS += strcasecmp.o
 
 # from libc