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make sure there is always a build directory to put doxgen stuff html in · 426a21e1Reed Kotler authored
currently if you do a make clean-all or have never done a code build, there will be no build directory and doxygen is going to want to create and put files into build/docs/html BUG= R=stichnot@chromium.org Review URL: https://codereview.chromium.org/1567313002 . Patch from Reed Kotler <rkotlerimgtec@gmail.com>.
426a21e1
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