build: replace build command

Building latex files may require to re-run the build command more than
once. The make target rules are normally called once.

Make also does not check the dependencies, which are caused by tex
statements (like \input{} or \includegraphics{}).

Both problems are solved by latexmk. This wrapper scans all
dependencies in the .tex file and calls the latex-command until all
depending steps are resolved.

The call of the build-command is forced in make, because the checking,
if a tex-file requires a rebuild is done by latexmk.

Signed-off-by: Holger Dengler <dengler@linutronix.de>

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