prototype for getCDKSwindowContents conflicts with man page

[lucas]

Man page for getCDKSwindowContents:
   char **getCDKSwindowContents (CDKSWINDOW *swindow, int *lines);

Prototype in include/swindow.h:
   chtype **getCDKSwindowContents (CDKSWINDOW *swindow, int *size);

Returning char ** is more sensible, since setCDKSwindowContents takes a
char ** as the contents argument, but changing the return value could
break existing code.  Personally I'm just going to code as if the man page 
matched the prototype.

- Lucas