[oe] Convert vala to new world staging

[Sebastian Spaeth]

All vala recipes currently complain about being lagacy stages. With a
lot of help from my friends I came up with this patch for
classes/vala.bbclass.

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I am currently testing a few compiles and installs with this patch. But
I want to gather feedback and ACKs from Mickey (OE vala God) and others.

Does this make sense?
Sebastian