[OE-core] [PATCH] base.bbclass: Don't warn about "invalid" PACKAGECONFIGs by default

[Olof Johansson]

Excerpts from Burton, Ross's message of 2015-07-30 11:53:39 +0200:
> Can you elaborate on what this approach you refer to is?

For some of our internal recipes, we export a list of PACKAGECONFIGs regardless
of their use in the recipe. This is to make sure the list is synchronized over
all the affected recipes.

-- 
olof johansson