icu-3.6 buildsystem contains small problem which causes some parallel
builds to fail. Fix that.
(From OE-Core rev: 41b7c955cfdc7b4d5c667c8a8742237d5edaca4f)
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>