AllocConsole in win_driver.c

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Hello, all.

An intrepid user by the name of avih has brought to the attention of 
freenode#ncurses a bug in ncurses's Windows driver.  In short, ncurses's 
Windows driver statically initializes a terminal emulator instance when linked 
to a GUI application.  The recipe for this bug involves little more than 
linking to the ncurses library.  More information can be found here:

https://github.com/mxe/mxe/pull/636#issuecomment-75236009

The offending line is here:

https://github.com/mirror/ncurses/blob/master/ncurses/win32con/win_driver.c#L2195

The obvious workaround involves foregoing AllocConsole() altogether, instead 
relying on AttachConsole(), but nobody in #ncurses was able to figure out the 
reason why AllocConsole() was initialized statically in the first place.

Thank you, and take care.

Grady Martin