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FIX: Treat warnings as errors in sphinx-build.

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git-svn-id: 0c92fc696bbb4411cda532d977721ec097865158@3696 59136d6a-6dff-0310-91ca-bfc5db6e1932

sofianehaddad/ot-svn,sofianehaddad/ot-svn,sofianehaddad/ot-svn,sofianehaddad/ot-svn,sofianehaddad/ot-svn