Moved all Win16 definitions out of the standard Windows headers.

diff --git a/dlls/gdi/printdrv.c b/dlls/gdi/printdrv.c
index ade5390..9a5fd3d 100644
--- a/dlls/gdi/printdrv.c
+++ b/dlls/gdi/printdrv.c
@@ -15,6 +15,7 @@
 #include <fcntl.h>
 #include "ldt.h"
 #include "winbase.h"
+#include "wine/winbase16.h"
 #include "wine/wingdi16.h"
 #include "winspool.h"
 #include "winerror.h"