struct by value break bool parameters

[Lorenzo Marcantonio]

Possibly related to #1473273

Given the following defs

(defcstruct key-t
  (keycode :int)
  (c :char)
  (pressed :bool)
  (lalt :bool)
  (lctrl :bool)
  (ralt :bool)
  (rctrl :bool)
  (shift :bool))

(defcfun ("TCOD_console_wait_for_keypress" console-wait-for-keypress) (:struct key-t)
  (flush :bool))

a call to (console-wait-for-keypress nil) gives

The value 0 is not of type SB-SYS:SYSTEM-AREA-POINTER.

... for some reason the bool is 'expected' as a pointer (in the original signature it was an int)

As a workaround, using :int instead of :bool in the definition seems to work (at least doesn't give an error)

[Attila Lendvai (attila-lendvai)]

pushed a failing test for this at: https://github.com/cffi/cffi/commit/9e75e110b0569f3199ff0042441bf56d1859f0cc