patch 8.1.1531: clipboard type name is inconsistent

Problem:    Clipboard type name is inconsistent.
Solution:   Rename VimClipboard to Clipboard_T.
diff --git a/src/os_qnx.c b/src/os_qnx.c
index 79b7ec0..a6f195e 100644
--- a/src/os_qnx.c
+++ b/src/os_qnx.c
@@ -48,18 +48,18 @@
 
 /* No support for owning the clipboard */
 int
-clip_mch_own_selection(VimClipboard *cbd)
+clip_mch_own_selection(Clipboard_T *cbd)
 {
     return FALSE;
 }
 
 void
-clip_mch_lose_selection(VimClipboard *cbd)
+clip_mch_lose_selection(Clipboard_T *cbd)
 {
 }
 
 void
-clip_mch_request_selection(VimClipboard *cbd)
+clip_mch_request_selection(Clipboard_T *cbd)
 {
     int		    type = MLINE, clip_length = 0, is_type_set = FALSE;
     void	    *cbdata;
@@ -102,7 +102,7 @@
 }
 
 void
-clip_mch_set_selection(VimClipboard *cbd)
+clip_mch_set_selection(Clipboard_T *cbd)
 {
     int type;
     long_u  len;