bitbake.conf: Remove unhelpful default value for EXTRA_OEMAKE
Setting EXTRA_OEMAKE to "-e MAKEFLAGS=" by default is a historical
accident and many classes (e.g. autotools.bbclass, module.bbclass) and
recipes have to override this default in order to work with sensible
build systems.
Now that openssl and pciutils have been fixed to set EXTRA_OEMAKE
explicitly it is possible to set EXTRA_OEMAKE = "".
Signed-off-by: Mike Crowe <mac@mcrowe.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
