[yocto] Add optional dependancies to the recipe

[Jerome.Haxhiaj at elektrobit.com]

Hi,
I'm building a recipe for a project where the final product will depends on
The fact that some dependencies are satisfied of not.
I would like to know I there is an environment variables that list all PROVIDES from all the layers,
in order to parse it and get the dependencies.

Jérôme Haxhiaj
Software Engineer

EB - Driving the Future of Automotive Software
Frankfurter Ring 117, 80807 München, Germany

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