Both SYSROOT_DIRS and SYSROOT_DIRS_BLACKLIST have more current
values.
(From yocto-docs rev: 750ae3fca42e273cd533f9c8b678c2e144164191)
Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Reviewed-by: Quentin Schulz <foss@0leil.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>