Add autogen.sh script that regenerates configure

Reviewed by Witold on Jabber.

diff --git a/autogen.sh b/autogen.sh
new file mode 100755 (executable)
index 0000000..3eaecd7
--- /dev/null
+++ b/autogen.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+# Run this script after modifying configure.in to generate configure
+autoreconf -i