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Also, add a target to the makefile to build a flashrom.8.html with groff.
To fix some formatting issues this adds some indention commands as well.

Corresponding to flashrom svn r1913.
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>