Implement the undocumented StartDocDlg[A|W].  These will be used by
StartDoc.

diff --git a/include/winspool.h b/include/winspool.h
index e9f9b33..6099a56 100644
--- a/include/winspool.h
+++ b/include/winspool.h
@@ -1160,6 +1160,10 @@
     LPSTR pDeviceName, LPSTR pPort, LPDEVMODEA pDevModeInput, LPSTR pProfile,
     DWORD fMode);
 
+LPSTR WINAPI StartDocDlgA(HANDLE hPrinter, DOCINFOA *doc);
+LPWSTR WINAPI StartDocDlgW(HANDLE hPrinter, DOCINFOW *doc);
+#define StartDocDlg WINELIB_NAME_AW(StartDocDlg)
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif