The assigned value clearly needs a leading space to be consistent with
standard "_append" usage.
(From OE-Core rev: f031aa735dbf5e566130e39498033b140bf2b7ba)
Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>