Add eap->skip checks to script_host_{execute_file,do_range}

As a safety measure, return immediately from these functions if
eap->skip is set.  This is set when VimL is being parsed, to skip past
dead code, and should not be executed.

src/nvim/ex_cmds2.c

@@ -4232,6 +4232,7 @@ static void script_host_execute(char *name, exarg_T *eap)
 
 static void script_host_execute_file(char *name, exarg_T *eap)
 {
+  if (!eap->skip) {
     uint8_t buffer[MAXPATHL];
     vim_FullName((char *)eap->arg, (char *)buffer, sizeof(buffer), false);
 
@@ -4243,15 +4244,18 @@ static void script_host_execute_file(char *name, exarg_T *eap)
     tv_list_append_number(args, (int)eap->line2);
     (void)eval_call_provider(name, "execute_file", args, true);
   }
+}
 
 static void script_host_do_range(char *name, exarg_T *eap)
 {
+  if (!eap->skip) {
     list_T *args = tv_list_alloc(3);
     tv_list_append_number(args, (int)eap->line1);
     tv_list_append_number(args, (int)eap->line2);
     tv_list_append_string(args, (const char *)eap->arg, -1);
     (void)eval_call_provider(name, "do_range", args, true);
   }
+}
 
 /// ":drop"
 /// Opens the first argument in a window.  When there are two or more arguments