[tor-bugs] #7622 [Flashproxy]: Add -4 and -6 options to flashproxy-client and flashproxy-reg-http

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#7622: Add -4 and -6 options to flashproxy-client and flashproxy-reg-http
------------------------+---------------------------------------------------
 Reporter:  dcf         |          Owner:  dcf
     Type:  defect      |         Status:  new
 Priority:  normal      |      Milestone:     
Component:  Flashproxy  |        Version:     
 Keywords:              |         Parent:     
   Points:              |   Actualpoints:     
------------------------+---------------------------------------------------
 `flashproxy-reg-email` supports `-4` and `-6` options; if you're dual-
 stack, and you've configured IPv4 port forwarding, `flashproxy-reg-email`
 may connect to the SMTP server over IPv6 and register your IPv6 address,
 leading to confusion.

 `flashproxy-client` should understand `-4` and `-6` and pass them to
 registration helpers that understand them. `flashproxy-reg-http` should
 use the same socket trick that `flashproxy-reg-email` uses.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7622>
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