Update to v5.0 kernel headers.

Test: Builds and boots on taimen.
Change-Id: I13843bf1ab30ea89a50852adc88f2cba8401bded
diff --git a/libc/kernel/uapi/linux/udp.h b/libc/kernel/uapi/linux/udp.h
index 3cd286b..278cf6c 100644
--- a/libc/kernel/uapi/linux/udp.h
+++ b/libc/kernel/uapi/linux/udp.h
@@ -30,6 +30,7 @@
 #define UDP_NO_CHECK6_TX 101
 #define UDP_NO_CHECK6_RX 102
 #define UDP_SEGMENT 103
+#define UDP_GRO 104
 #define UDP_ENCAP_ESPINUDP_NON_IKE 1
 #define UDP_ENCAP_ESPINUDP 2
 #define UDP_ENCAP_L2TPINUDP 3