Add MIT license to autogen.sh and share/genbuild.sh

Github-Pull: #8784
Rebased-From: 3b4b6dcdd7

autogen.sh

@@ -1,4 +1,8 @@
 #!/bin/sh
+# Copyright (c) 2013-2016 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
 set -e
 srcdir="$(dirname $0)"
 cd "$srcdir"

share/genbuild.sh

@@ -1,4 +1,8 @@
 #!/bin/sh
+# Copyright (c) 2012-2016 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
 if [ $# -gt 1 ]; then
     cd "$2"
 fi