vim-patch:9.0.1101: unused global variable (#21549)

Problem:    Unused global variable.
Solution:   Remove the variable. (closes vim/vim#11752)

b536540ab3

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/main.c

@@ -1406,8 +1406,6 @@ static void init_startuptime(mparm_T *paramp)
       break;
     }
   }
-
-  starttime = time(NULL);
 }
 
 static void check_and_set_isatty(mparm_T *paramp)