spoolss: Add a stub for WaitForSpoolerInitialization.

dlls/spoolss/spoolss.spec

@@ -142,7 +142,7 @@
 @ stub UpdatePrinterRegAll
 @ stub UpdatePrinterRegUser
 @ stub WaitForPrinterChange
-@ stub WaitForSpoolerInitialization
+@ stdcall WaitForSpoolerInitialization()
 @ stub WritePrinter
 @ stub XcvDataW
 @ stub bGetDevModePerUser

dlls/spoolss/spoolss_main.c

@@ -248,3 +248,12 @@ BOOL WINAPI SpoolerInit(void)
     FIXME("() stub\n");
     return TRUE;
 }
+
+/******************************************************************
+ *   WaitForSpoolerInitialization   [SPOOLSS.@]
+ */
+BOOL WINAPI WaitForSpoolerInitialization(void)
+{
+    FIXME("() stub\n");
+    return TRUE;
+}