Ensure that wait_timeout doesn't overflow on windows. (Bug #2400)

sql/mysqld.cc

@@ -4093,7 +4093,8 @@ this value; if zero (the default): when the size exceeds max_binlog_size. \
    "The number of seconds the server waits for activity on a connection before closing it",
    (gptr*) &global_system_variables.net_wait_timeout,
    (gptr*) &max_system_variables.net_wait_timeout, 0, GET_ULONG,
-   REQUIRED_ARG, NET_WAIT_TIMEOUT, 1, LONG_TIMEOUT, 0, 1, 0},
+   REQUIRED_ARG, NET_WAIT_TIMEOUT, 1, IF_WIN(INT_MAX32/1000, LONG_TIMEOUT),
+   0, 1, 0},
   { "default-week-format", OPT_DEFAULT_WEEK_FORMAT,
     "The default week format used by WEEK() functions.",
     (gptr*) &global_system_variables.default_week_format,