Add task-configure and few more supported values of TARGET_OS override.
(From OE-Core rev: 1172f9593902f28ddd8da47de6bd51cda9a0f86a)
Signed-off-by: Denys Dmytriyenko <denis@denix.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>