[dpdk-dev] [PATCH] doc: add index file to doxygen dependencies

[Thomas Monjalon]

> The doxygen index file is not printed as a processed file by doxygen so it
> does not appear in the output .d (dependency file) list automatically
> generated. Therefore, for correct rebuild tracking, we need to explicitly
> include it as a dependency of the doxygen job.
> 
> Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>

Applied, thanks