add autogen.sh file

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

autogen.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+git submodule update --init --recursive
+
+test -n "$srcdir" || srcdir=`dirname "$0"`
+test -n "$srcdir" || srcdir=.
+
+olddir=`pwd`
+cd $srcdir
+
+if ! (autoreconf --version >/dev/null 2>&1); then
+        echo "*** No autoreconf found, please install it ***"
+        exit 1
+fi
+
+mkdir -p m4
+
+autoreconf --force --install --verbose
+
+cd $olddir
+test -n "$NOCONFIGURE" || "$srcdir/configure" "$@"