Moved FatalAppExit functions to win32/except.c.
Added a few uses of Callout instead of referencing USER functions
directly.

diff --git a/misc/printdrv.c b/misc/printdrv.c
index 8b19090..ae6b39d 100644
--- a/misc/printdrv.c
+++ b/misc/printdrv.c
@@ -603,8 +603,7 @@
 
     TRACE("%04x %04x '%s'\n", hJob,  cchMsg, lpMsg);
 
-    nRet = MessageBox16(0, lpMsg, "Printing Error", MB_OKCANCEL);
-    return nRet;
+    return Callout.MessageBoxA(0, lpMsg, "Printing Error", MB_OKCANCEL);
 }