Avoid sending info strings before 'uci' has been received

Avoid sending info strings before 'uci' has been received

Do not send the following info string on the first call to
aligned_ttmem_alloc() on Windows:

  info string Hash table allocation: Windows large pages [not] used.

The first call occurs before the 'uci' command has been received. This
confuses some GUIs, which expect the first engine-sent command to be
'id' as the response to the 'uci' command. (see https://github.com/official-stockfish/Stockfish/issues/2681)

closes https://github.com/official-stockfish/Stockfish/pull/2689

No functional change.