Should get win16drv AbortProc working. Hopefully.

misc/callback.c

diff --git a/misc/callback.c b/misc/callback.c
index 1305961..be65ec6 100644
--- a/misc/callback.c
+++ b/misc/callback.c
@@ -276,7 +276,8 @@
     NULL,                             /* CallDrvRealizeProc */
     NULL,                             /* CallDrvStretchBltProc */
     NULL,                             /* CallDrvExtTextOutProc */
-    NULL                              /* CallDrvGetCharWidth */
+    NULL,                             /* CallDrvGetCharWidth */
+    NULL                              /* CallDrvAbortProc */
 };
 
 const CALLBACKS_TABLE *Callbacks = &CALLBACK_WinelibTable;