bug#9444: url-retrieve does not work with HTTPS on win32

[Claudio Bley]

Hi.

Using a recent emacs built from trunk, GNU TLS 2.10.5 (non Cygwin),
trying to retrieve a HTTPS URLs fails because of the ^M characters
littered in the buffer.

Run "emacs -Q":

(url-retrieve "https://google.com/";
              #'identity)

The buffer contains CRLF line endings and hence the tls-end-of-info
regexp does not match. gnutls-cli goes up to 100% CPU usage.

Explicitly setting coding-system-for-read to emacs-mule or
inhibit-eol-conversion to t has had no effect.

Cheers,
Claudio