gmmproc: _WRAP_METHOD: Allow multi-word parameter types (unsigned int)

* tools/pm/Function.pm: parse_param(): Allow multi-word parameter types,
as in _WRAP_METHOD(void set_button(unsigned int button = 0),
                   gtk_gesture_single_set_button).
Affects _WRAP_METHOD, _WRAP_SIGNAL, _WRAP_CTOR, _WRAP_CREATE, _WRAP_VFUNC.