patch 8.2.3881: QNX: crash when compiled with GUI but using terminal

Problem:    QNX: crash when compiled with GUI but using terminal.
Solution:   Check the gui.in_use flag. (Hirohito Higashi, closes #9391)

src/main.c

@@ -835,7 +835,7 @@ vim_main2(void)
 #if defined(FEAT_GUI)
     // When tab pages were created, may need to update the tab pages line and
     // scrollbars.  This is skipped while creating them.
-    if (first_tabpage->tp_next != NULL)
+    if (gui.in_use && first_tabpage->tp_next != NULL)
     {
 	out_flush();
 	gui_init_which_components(NULL);

src/version.c

@@ -749,6 +749,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3881,
 /**/
     3880,
 /**/