spoolss: Add a stub for SplIsUpgrade.
diff --git a/dlls/spoolss/spoolss.spec b/dlls/spoolss/spoolss.spec
index b7fc0bd..2f893d5 100644
--- a/dlls/spoolss/spoolss.spec
+++ b/dlls/spoolss/spoolss.spec
@@ -122,7 +122,7 @@
 @ stub SplDriverUnloadComplete
 @ stub SplGetSpoolFileInfo
 @ stdcall SplInitializeWinSpoolDrv(ptr)
-@ stub SplIsUpgrade
+@ stdcall SplIsUpgrade()
 @ stub SplProcessPnPEvent
 @ stub SplReadPrinter
 @ stub SplRegisterForDeviceEvents
diff --git a/dlls/spoolss/spoolss_main.c b/dlls/spoolss/spoolss_main.c
index 52365c7..9a9ec48 100644
--- a/dlls/spoolss/spoolss_main.c
+++ b/dlls/spoolss/spoolss_main.c
@@ -209,3 +209,12 @@
     return TRUE;
 
 }
+
+/******************************************************************
+ *   SplIsUpgrade   [SPOOLSS.@]
+ */
+BOOL WINAPI SplIsUpgrade(void)
+{
+    FIXME("() stub\n");
+    return FALSE;
+}