New OpenSSL Build Script

Initial commit of a quick attempt at making a build script for OpenSSL.
This assumes some things present on my build VM.  Appears to work at
least on an Ubuntu VM as well as on a Mac as long as mingw is installed.

Signed-off-by: Eric F Crist <ecrist@secure-computing.net>

distro/windows/build/build_openssl.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+#
+# This script clones, switches to a tag (CLI option)
+# then attempts to build openssl binaries
+
+# make a temporary working directory
+tempdir=$(mktemp -d)
+cd "$tempdir" || exit 1
+
+# clone repo
+git clone https://github.com/openssl/openssl.git && cd openssl
+
+# check out the tag from the CLI, if nothing passed, find latest
+latest=$(git tag --sort=committerdate --list 'openssl-3.*' | tail -1)
+
+# checkout that tag
+git checkout "tags/$latest"
+
+# crosscompile Windows 32
+./Configure --cross-compile-prefix=i686-w64-mingw32- mingw
+make
+
+# build done, save what we want
+mkdir "$tempdir/win32/"
+cp libcrypto-3.dll libssl-3.dll apps/openssl.exe "$tempdir/win32"
+
+# clean our source tree
+make clean
+
+# build 64-bit version
+./Configure --cross-compile-prefix=x86_64-w64-mingw32- mingw64
+make
+
+# build done, save what we want
+mkdir "$tempdir/win64/"
+cp libcrypto-3-x64.dll libssl-3-x64.dll apps/openssl.exe "$tempdir/win64"
+
+# we're done, make the zip file
+cd "$tempdir"
+zip "$latest.zip" win32/* win64/* && cp "$latest.zip" ~/
+
+# remove temp dir
+cd /tmp/
+rm -rf "$tempdir"