Drop most EXTRA_OEMAKE settings as no longer necessary.
(makefiles use weak assignments and shell variables then
take precedence).
License-Update: clarification that it's gpl2-or-later.
(From OE-Core rev: a4dde4e0dcc2cc75c4eec5d78fbf2a1e47401050)
Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>