8210350: -Wl,-z,defs JDK 8 build failure

Reviewed-by: erikj

make/linux/makefiles/saproc.make

@@ -97,7 +97,7 @@ $(LIBSAPROC): $(SASRCFILES) $(SAMAPFILE)
 	           $(SA_DEBUG_CFLAGS)                                   \
 	           $(EXTRA_CFLAGS)                                      \
 	           -o $@                                                \
-	           -lthread_db
+	           -lthread_db -ldl
 ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
   ifneq ($(STRIP_POLICY),no_strip)
 	$(QUIETLY) $(OBJCOPY) --only-keep-debug $@ $(LIBSAPROC_DEBUGINFO)