bug#24229: 25.1; Can't set EPA program

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Cc: Eli Zaretskii <eliz@gnu.org>,  nick@tenpoint.co.nz,  24229@debbugs.gnu.org
> Date: Thu, 18 Aug 2016 11:46:52 -0400
> 
> It's not uncommon for the doc of Emacs variables to say:
> 
>   Setting this variable directly does not have any effect;
>   instead use \\[customize] or <some setter function>.
> 
> IMO that's all that's needed here too.

If there's no better way, yes.