linux: update headers from current kernel master

src/basic/linux/update.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -eu
+
+for i in *.h */*.h; do
+    if [[ $i == 'wireguard.h' ]]; then
+        curl https://raw.githubusercontent.com/WireGuard/WireGuard/master/src/uapi/$i -o $i
+    else
+        curl https://raw.githubusercontent.com/torvalds/linux/master/include/uapi/linux/$i -o $i
+    fi
+
+    sed -i -e 's/__user //g' -e '/^#include <linux\/compiler.h>/ d' $i
+done