[stunnel-users] Public domain [PATCH] support environment variables in config file

[Dmitry Bakshaev]

the problem frequently occurs on the client side: admin need to configure
stunnel for multiple users.
every user has own key, certificate, own permissions on file system (for
log-files, etc)

this patch allow to write flexible config.

some examples:
cert = %USERPROFILE%\.config\my.pem (windows)
cert = ${HOME}/.config/my.pem (other)

output = %APPDATA%\stunnel.log (windows)
output = ${HOME}/stunnel.log (other)

CAfile = %ALLUSERSPROFILE%\ourCAbundle.crt (windows)
CAfile = /etc/ssl/certs/ourCAbundle.crt (other, not using variables)

"secure" :) random port example:
...
[srv1]
accept = 127.0.0.1:%SRV1_PORT% (windows)
accept = 127.0.0.1:${SRV1_PORT} (other)
...
start stunnel (batch-file or shell-script):
set SRV1_PORT=%RANDOM% (windows)

limitations:
1. don't support unicode on windows (localized usernames, files, etc)
2. only ${NAME} syntax supported on *nix (not $NAME).
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