PARQUET-1267: [C++] replace "unsafe" std::equal by std::memcmp
PARQUET-1267: [C++] replace "unsafe" std::equal by std::memcmp

Author: rip.nsk <rip.nsk@gmail.com>

Closes #451 from rip-nsk/PARQUET-1267 and squashes the following commits:

12d2386 [rip.nsk] fix of the fix.
7682c83 [rip.nsk] PARQUET-1267: [C++] replace "unsafe" std::equal by std::memcmp

Change-Id: I4f2ed37057634cb261bad0171cd9244a871099df

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