[OE-core] [PATCH] classes/waf: Fix builds when B != S

[Burton, Ross]

On Fri, 30 Nov 2018 at 21:56, Joshua Watt <jpewhacker at gmail.com> wrote:
> +B = "${WORKDIR}/${BPN}-${PV}"

That's the default, so redundant.

Does waf support out-of-tree builds sufficiently well that we can
default  - or even mandate - out of tree?  i.e. follow meson and
cmake, and just set B=$WORKDIR/build in the class.

Ross