autoconf: Add autogen.sh

Nothing uses this yet

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/autogen.sh b/autogen.sh
new file mode 100755 (executable)
index 0000000..14efa37
--- /dev/null
+++ b/autogen.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+set -e
+autoheader
+autoconf