Fix Clang compile error#1

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raghunayak wants to merge 13 commits intomhellmic:masterfrom

raghunayak:master

Commits on Jan 30, 2013

make libaws able to be put under a subdirectory
lunastorm
committed

Commits on Feb 22, 2013

fix build error (offsetof from stddef.h not included)
lunastorm
committed

Commits on Oct 8, 2013

fix compile.
fanxu
committed

Commits on Aug 22, 2014

Commits on Aug 29, 2014

Merge pull request #1 from magiczhao/master
fanxu
committed

Commits on Sep 3, 2014

Commits on Sep 5, 2014

add attribute in getQueueAttribute interface
magiczhao
committed

Commits on May 10, 2019