Fix for `slow-startup-printer': use PRINTER_INFO_4 on NT-class systems, which

apparently tries less hard to find printers so won't slow the system down.

Tested on 2000 and 98; in both cases printer enumeration and printing worked
as well as they did in 2003-08-21.

Made a single shared copy of osVersion in winmisc.c so that printing.c can
find it. Made other users (window.c, pageant.c) use this copy.

[originally from svn r3411]

winstuff.h

@@ -322,6 +322,9 @@ int SaneDialogBox(HINSTANCE hinst,
 
 void SaneEndDialog(HWND hwnd, int ret);
 
+extern OSVERSIONINFO osVersion;
+BOOL init_winver(void);
+
 /*
  * Exports from sizetip.c.
  */