Thanks for the further investigation. I solved the problem for grep by
installing the following patch, and am closing the bug report.
https://web.cvs.savannah.gnu.org/viewvc/grep/grep/.htaccess?r1=1.1&r2=1.2
Presumably GNU project web pages should routinely have .htaccess files
that say something like this:
<Files "*.txt">
AddDefaultCharset utf-8
ForceType text/plain
</Files>
as the old Windows-1252 default no longer makes sense. I'll take a look
at doing this for the projects I help maintain.
Alternatively (and more efficiently) this could be addressed by changing
the Apache configuration on Savannah; however, I lack admin access for that.
