[cmake] OpenMVG_BUILD_DOC to build the doc (optional)
[cmake] OpenMVG_BUILD_DOC to build the doc (optional)

ON by default

openMVG/openMVG,poparteu/openMVG,openMVG/openMVG,poparteu/openMVG,poparteu/openMVG,poparteu/openMVG,openMVG/openMVG,openMVG/openMVG,openMVG/openMVG