Urvang Joshi d71a231c49 Add compiler warning flag -Wextra and fix related warnings.
Note: some of these warnings are enabled by a combination of -Wunused
(added earlier) and -Wextra.

Cherry-picked from aomedia/master: 4790a69

Change-Id: I322a1366bd4fd6c0dec9e758c2d5e88e003b1cbf
2016-10-20 15:49:16 -07:00
..
2016-09-02 19:52:03 +00:00
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2016-10-12 10:50:08 -07:00
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