bitbake.conf: Add inclusion of BB_CURRENT_MC.conf after local.conf
People are strugling with multiconfig as the up front inclusion of the
configuration file doesn't do what people expect. The only way to meet
user expectations is to include the file immediately after local.conf.
We add BB_CURRENT_MC to bitbake so that the metadata can determine when
to include the extra configuration.
(From OE-Core rev:
a6a3894fb2cb2097d2404b8b8cb2b85df595cfa9)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
