release: add win detached sig creator and our cert chain

To ensure that this is the correct chain, it is pulled from a previous release
binary.

Procedure:
$ osslsigncode extract-signature -pem -in bitcoin-0.13.2-win32-setup.exe \
    -out bitcoin-0.13.2-win32-setup.exe.pem
$ openssl pkcs7 -print_certs -in bitcoin-0.13.2-win32-setup.exe.pem \
    -out win-codesign.cert

Hand-edit to remove comments, as well as the timestamp cert.

contrib/windeploy/detached-sig-create.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+# Copyright (c) 2014-2015 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 [ -z "$OSSLSIGNCODE" ]; then
+  OSSLSIGNCODE=osslsigncode
+fi
+
+if [ ! -n "$1" ]; then
+  echo "usage: $0 <osslcodesign args>"
+  echo "example: $0 -key codesign.key"
+  exit 1
+fi
+
+OUT=signature-win.tar.gz
+SRCDIR=unsigned
+WORKDIR=./.tmp
+OUTDIR="${WORKDIR}/out"
+OUTSUBDIR="${OUTDIR}/win"
+TIMESERVER=http://timestamp.comodoca.com
+CERTFILE="win-codesign.cert"
+
+mkdir -p "${OUTSUBDIR}"
+basename -a `ls -1 "${SRCDIR}"/*-unsigned.exe` | while read UNSIGNED; do
+  echo Signing "${UNSIGNED}"
+  "${OSSLSIGNCODE}" sign -certs "${CERTFILE}" -t "${TIMESERVER}" -in "${SRCDIR}/${UNSIGNED}" -out "${WORKDIR}/${UNSIGNED}" "$@"
+  "${OSSLSIGNCODE}" extract-signature -pem -in "${WORKDIR}/${UNSIGNED}" -out "${OUTSUBDIR}/${UNSIGNED}.pem" && rm "${WORKDIR}/${UNSIGNED}"
+done
+
+rm -f "${OUT}"
+tar -C "${OUTDIR}" -czf "${OUT}" .
+rm -rf "${WORKDIR}"
+echo "Created ${OUT}"

contrib/windeploy/win-codesign.cert

@@ -0,0 +1,99 @@
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+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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