bug#54921: eww/url mishandles IDN over proxy

[Andreas Schwab]

I have configured Privoxy as the http/https proxy.  When visiting a URL
with an IDN address url-retrieve uses the original domain name for the
proxy connection, not the IDNA encoded name, causing Privoxy to return a
404 page.  I'm not sure if that is a bug in Privoxy or in eww.  I could
not find any RFC on that topic.

(eww "https://www.pimmelgate-süd.de/";) returns the Privoxy 404 page,
whereas (eww "https://xn--pimmelgate-sd-7ob.de/";) returns the actual web
page.

-- 
Andreas Schwab, schwab@linux-m68k.org
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