* w32/main.c: Remove all WindowsCE stuff.  Include unistd.h.
(move_mouse_and_click): Remove.  This does not seem to work anymore
correctly.
(dlg_proc, w32_cmd_handler): Remove the Foregound window stuff.  If we
really want this we need to use the hack from our QT Pinentry which
has meanwhile been included into QT proper.
(main): No more need to dynload a syscall.
* tty/pinentry-tty (button): Make use of isalnum more robust.