bug#15260: cannot build in a directory with non-ascii characters

[Glenn Morris]

Eli Zaretskii wrote:

> mule-cmds.el calls reset-language-environment, and language/english.el
> calls set-language-info-alist; both have the effect of resetting
> default-file-name-coding-system to latin-1 (!? an interesting
> "default" for a Unicode-era Emacs, perhaps Handa-san could comment why
> we still do that).

I know nothing about this, but eg glib defaults to utf-8, which seems
like a better default to me these days:

https://developer.gnome.org/glib/stable/glib-Character-Set-Conversion.html#file-name-encodings