This recipe currently relies on EXTRA_OEMAKE having been set to
"-e MAKEFLAGS=" in bitbake.conf to operate. It is necessary to make this
explicit so that the default in bitbake.conf can be change
(From OE-Core rev: 4c9cf1888fb907a037f0e51eb007aef10cb9f735)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>