Update to v4.19 kernel headers.
Test: Builds and boots.
Change-Id: I99a9ed79666e143b47f02ca4e59eed94f69b7e4a
diff --git a/libc/kernel/uapi/linux/nbd.h b/libc/kernel/uapi/linux/nbd.h
index 749c38a..3b74393 100644
--- a/libc/kernel/uapi/linux/nbd.h
+++ b/libc/kernel/uapi/linux/nbd.h
@@ -45,6 +45,7 @@
#define NBD_FLAG_CAN_MULTI_CONN (1 << 8)
#define NBD_CMD_FLAG_FUA (1 << 16)
#define NBD_CFLAG_DESTROY_ON_DISCONNECT (1 << 0)
+#define NBD_CFLAG_DISCONNECT_ON_CLOSE (1 << 1)
#define NBD_REQUEST_MAGIC 0x25609513
#define NBD_REPLY_MAGIC 0x67446698
struct nbd_request {