make sure there is always a build directory to put doxgen stuff html in

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>.

make sure there is always a build directory to put doxgen stuff html in
426a21e1 · Reed Kotler · Jim Stichnoth · 8a105fd7 · 426a21e1
Commit 426a21e1 authored Jan 07, 2016 by Reed Kotler Committed by Jim Stichnoth Jan 07, 2016
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Makefile.standalone docs/Makefile.standalone +1 -0

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--- a/docs/Makefile.standalone
+++ b/docs/Makefile.standalone
 .PHONY: all

 all:
+	mkdir -p ../build
 	doxygen Doxyfile
 	@echo See file://`pwd`/../build/docs/html/index.html