setupx: Add stub for DiInstallClass.

dlls/setupapi/setupx.spec

@@ -154,7 +154,7 @@
 318  pascal -ret16 DiCreateDevRegKey (ptr ptr word str word) DiCreateDevRegKey16
 319  pascal -ret16 DiOpenDevRegKey (ptr ptr word) DiOpenDevRegKey16
 320  stub     DiInstallDrvSection #(str str str str long)
-321  stub     DiInstallClass #(str long)
+321  pascal -ret16 DiInstallClass (str long) DiInstallClass16
 322  stub     DiOpenClassRegKey #(ptr str)
 323  stub     Display_SetFontSize #(str)
 324  stub     Display_OpenFontSizeKey #(ptr)

dlls/setupapi/setupx_main.c

@@ -587,6 +587,17 @@ RETERR16 WINAPI CtlGetLddPath16(LOGDISKID16 ldid, LPSTR szPath)
 }
 
 /***********************************************************************
+ *		DiInstallClass		(SETUPX.321)
+ *
+ * Install Class from an INF file (in [ClassInstall] section)
+ */
+RETERR16 WINAPI DiInstallClass16(LPCSTR lpszInfFileName, DWORD dwFlags)
+{
+    FIXME("(%s, %u), stub.\n", lpszInfFileName, dwFlags);
+    return 0;
+}
+
+/***********************************************************************
  *		CtlSetLddPath		(SETUPX.508)
  *
  * Sets the path of an LDD.