[gtkada] SetCursorPos error on windows

[Samuel Hunter]

Sorry for not replying to the original post, but I only subscribed
today and  found that email in the archive.

The "undefined reverence to 'SetCursorPos at 8'" error went away from
me when I added
-largs -mwindows to my gnatmake command.

I'm new to gnat and gtkada (and windows programming for that matter),
so I make no claims to the appropriateness of the solution.

I hope this help someone,
Sam