Update to v5.0 kernel headers.

Test: Builds and boots on taimen.
Change-Id: I13843bf1ab30ea89a50852adc88f2cba8401bded
diff --git a/libc/kernel/uapi/linux/virtio_config.h b/libc/kernel/uapi/linux/virtio_config.h
index ddf5e4e..c9ec83f 100644
--- a/libc/kernel/uapi/linux/virtio_config.h
+++ b/libc/kernel/uapi/linux/virtio_config.h
@@ -33,5 +33,7 @@
 #endif
 #define VIRTIO_F_VERSION_1 32
 #define VIRTIO_F_IOMMU_PLATFORM 33
+#define VIRTIO_F_RING_PACKED 34
+#define VIRTIO_F_ORDER_PLATFORM 36
 #define VIRTIO_F_SR_IOV 37
 #endif