patch 8.2.2070: can't get the exit value in VimLeave(Pre) autocommands
Problem: Can't get the exit value in VimLeave or VimLeavePre autocommands.
Solution: Add v:exiting like in Neovim. (Yegappan Lakshmanan, closes #7395)
diff --git a/src/vim.h b/src/vim.h
index 6dcc509..eda0734 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1996,7 +1996,8 @@
#define VV_ECHOSPACE 93
#define VV_ARGV 94
#define VV_COLLATE 95
-#define VV_LEN 96 // number of v: vars
+#define VV_EXITING 96
+#define VV_LEN 97 // number of v: vars
// used for v_number in VAR_BOOL and VAR_SPECIAL
#define VVAL_FALSE 0L // VAR_BOOL