esp8266: Let RTC work correctly after deepsleep.
By design, at wake up from deepsleep, the RTC timer will be reset, but the data stored in RTC memory will not [1]. Therefore, we have to adjust delta in RTC memory before going into deepsleep to get almost correct time after waking up. [1] http://bbs.espressif.com/viewtopic.php?t=1184#p4082
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