"password change disable" feature

[chipitsine]

I do not lnow any case when openvpn-gui is compiled with that feature defined.
do we really need it?

and, if we do, should I add couple of configuration to travis-ci?

[selvanair]

@chipitsine : Its a useful feature to be able to build without openssl, so I think we should keep it. And make it even easier to use by fixing the unconditional check on openssl that you pointed out.

[chipitsine]

so, I should expand build matrix in travis-ci, right?

[selvanair]

Yes, that may be useful.

[chipitsine]

ok, that makes sense.

I'll do another PR after this one #50 is merged