kailiu 83e7842f80 Improve the check for header guard
Summary:
cpplint.py only recognize `#ifdef HEADER_GUARD` as header guard.
This patch enables the check for `#pragma once`.

Test Plan: New arc lint exclude the false alarm for `#pragma once`.

Reviewers: dhruba, sdong, igor, haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D16227
2014-02-19 01:02:34 -08:00
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