Removes warning regarding app.detect_dependecies

As discussed here https://github.com/tkadauke/motion-support/commit/a0a640db2f39d3dbb19985efb53385b15d59314a#commitcomment-5754306 motion-support seems to work just fine even with detect_dependencies set to true, and some apps won't build at all when set to false.
Merge pull request #22 from balvig/patch-1

Removes warning regarding app.detect_dependecies