configure: use `foo` instead of $(foo)
authorJens Axboe <axboe@kernel.dk>
Tue, 26 Feb 2013 20:55:08 +0000 (21:55 +0100)
committerJens Axboe <axboe@kernel.dk>
Tue, 26 Feb 2013 20:55:08 +0000 (21:55 +0100)
Seems to work everywhere, whereas $(foo) does not work on
some variants of FreeBSD.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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