add support for Blackfin symbol prefixes to examples

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/Makefile b/Makefile
index 2413ed6..dc023a9 100644
--- a/Makefile
+++ b/Makefile
@@ -312,7 +312,7 @@
 		$(OBJDUMP) -d $< > $@
 
 $(obj)u-boot:		depend $(SUBDIRS) $(OBJS) $(LIBS) $(LDSCRIPT)
-		UNDEF_SYM=`$(OBJDUMP) -x $(LIBS) |sed  -n -e 's/.*\(__u_boot_cmd_.*\)/-u\1/p'|sort|uniq`;\
+		UNDEF_SYM=`$(OBJDUMP) -x $(LIBS) |sed  -n -e 's/.*\($(SYM_PREFIX)__u_boot_cmd_.*\)/-u\1/p'|sort|uniq`;\
 		cd $(LNDIR) && $(LD) $(LDFLAGS) $$UNDEF_SYM $(__OBJS) \
 			--start-group $(__LIBS) --end-group $(PLATFORM_LIBS) \
 			-Map u-boot.map -o u-boot