[oe] building meta-toolchain-qt5 without opengl

[Ivan Sergio Borgonovo]

I've tested all I could add back to RDEPENDS and in fact I could add
more than what I've done in my previous patch proposal.

All qmlplugins and qt3d stuff had to be removed and that seems reasonable.

The only thing I was not able to add back was qttools-plugins that
failed to bake with

no package provides qttools-plugins

If now things sound more reasonable to people more knowledgeable than me
that can justify why qttools-plugins can't be baked I'll repost the
patch in the hope it gets accepted and will make things easier to people
having to solve the same problem after me.

thanks

-- 
Ivan Sergio Borgonovo
http://www.webthatworks.it