bug#23620: 24.3; url-retrieve-synchronously doesn't fallback to IPv4

[Paul Eggert]

No further comment on the proposed patch, and as it should be a win for 
non-WINDOWSNT I decided to install it on the Emacs master branch. I 
looked into how libcurl addresses the issue, and it doesn't care whether 
the errno value reported by getsockopt is ECONNREFUSED so I adjusted the 
Emacs patch accordingly (see attached) before installing. Please give it 
a try if you have the time.

This patch does not affect behavior if WINDOWSNT. If the bug does not 
occur on MS-Windows I hope we can close Bug#17976. Otherwise we should 
leave the bug open for the WINDOWSNT case.

0001-Try-other-addresses-when-connecting-to-multihomed.patch
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