[Freeciv-Dev] (PR#12244) gui-win32: support for real_timer_callback() return value

["James Canete" <use_less@xxxxxxxxxxx>]

<URL: http://bugs.freeciv.org/Ticket/Display.html?id=12244 >

This patch throws out the old win32 timer callback functions, and
instead uses a freeciv timer to determine when to call
real_timer_callback.  My rationale for this is that the win32 timers
simply add a message to the win32 message queue, and I'd rather deal
with the timing myself. :)

This patch also improves the behavior of calling an idle function, only
calling it when all queues are empty.

-James Canete

win32-timercallback.diff
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