bb.utils.environment() is a context manager to alter os.environ inside
a specific block, restoring it after the block is closed.
(Bitbake rev: 9974848f67581ff7d76cef52a94f505af99b4932)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>