Fix Mac build.

Mac doesn't have macro O_LARGEFILE and it supports 64-bit file offset by
default.

Bug: 21668279
Change-Id: I8312d4d7937eb3392fd0dd763e5be95ab9047cb7
(cherry picked from commit 43b6f87a3381ed51b3529d22eeff8c58cc23f3f2)
diff --git a/Android.mk b/Android.mk
index 02fd6da..d30ebb6 100644
--- a/Android.mk
+++ b/Android.mk
@@ -10,7 +10,7 @@
 LOCAL_MODULE := libvboot_util-host
 
 ifeq ($(HOST_OS),darwin)
-LOCAL_CFLAGS += -DHAVE_MACOS
+LOCAL_CFLAGS += -DHAVE_MACOS -DO_LARGEFILE=0
 endif
 
 # These are required to access large disks and files on 32-bit systems.