[Freeciv-Dev] (PR#9742) win32: authentication support

["James Canete" <use_less@xxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=9742 >

Here's a patch that adds rudimentary authentication support for the
win32 client.

It pops up a text entry dialog (identical to the found a new city
dialog) for each authentication request the server sends, and sends back
the contents when either button (ok or cancel) is pressed.  It also
doesn't hide the password, and the dialogs seem to pop up at random
places on the screen.

Tested with PR#9739 but should work without it.

-James Canete

win32-authsupport.diff
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