[PATCH] Fix type mismatch warning when compiling on Windows

[Carlo Bramini]

The function COMBO_SelectString() has parameter "start" declared as INT, but there is not a good reason to do so, since it is used only as parameter for SendMessage(). I suggest to change it from INT to WPARAM, for removing the cast to INT inside CB_SELECTSTRING and fixing the warning that I'm getting on Windows because INT to WPARAM type mismatch.

Sincerely.

Signed-off-by: Carlo Bramini