Fix font server reconnection timeout

The great libxfont2 rewrite 135fb032 split
fs_wakeup into fs_wakeup and fs_fd_handler. The fs_fd_handler side is
called when there is new data on the socket. The fs_wakeup side is called
on a timeout.

If there's a connection timeout, the block handler will set the timeout
to zero, expecting fs_wakeup to handle the timeout. Therefore, we need to
call _fs_check_reconnect in fs_wakeup to handle the connection timeout.
If we don't, the X server will go to 100% CPU (and the font server
connection will not be retried).

Signed-off-by: Peter Harris <pharris@opentext.com>
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