Merge pull request #1 from google/disable-build-id

Fix build with gcc-9 arm-linux-gnueabi toolchain
diff --git a/Makefile b/Makefile
index b7f705c..3b2b2f3 100644
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,7 @@
 CFLAGS		= -Os -g -mcpu=cortex-a9
 ASFLAGS		= $(CFLAGS) -Wa,-mcpu=cortex-a9+mp
 LDSCRIPT	= bootrom.ld
-LDFLAGS		= -nostdlib -T $(LDSCRIPT)
+LDFLAGS		= -Wl,--build-id=none -static -nostdlib -T $(LDSCRIPT)
 
 OBJS		:= start.o image.o