update farmhash.cpp to avoid an unused function error on android
Summary: The `Fetch128()` function is only used in `#ifdef` sections that check for either `can_use_sse42` or `can_use_sse41 && x86_64`. On Android builds this function was defined as a static function that was never used, causing compiler errors when compiled with `-Werror -Wunused-function` Reviewed By: mzlee Differential Revision: D26865431 fbshipit-source-id: 5cd7ce12aa614f3d904df40ba21842223502a9ec
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