Update to v5.0 kernel headers.

Test: Builds and boots on taimen.
Change-Id: I13843bf1ab30ea89a50852adc88f2cba8401bded
diff --git a/libc/kernel/uapi/linux/if_bridge.h b/libc/kernel/uapi/linux/if_bridge.h
index 7e6a72f..31683c1 100644
--- a/libc/kernel/uapi/linux/if_bridge.h
+++ b/libc/kernel/uapi/linux/if_bridge.h
@@ -237,4 +237,12 @@
   __u64 mcast_bytes[BR_MCAST_DIR_SIZE];
   __u64 mcast_packets[BR_MCAST_DIR_SIZE];
 };
+enum br_boolopt_id {
+  BR_BOOLOPT_NO_LL_LEARN,
+  BR_BOOLOPT_MAX
+};
+struct br_boolopt_multi {
+  __u32 optval;
+  __u32 optmask;
+};
 #endif