tests/unit: Really build pbkdf test on macOS

Fix a typo to run the pbkdf crypto cipher tests on macOS.

 $ make check-unit
   ...
   87/102 qemu:unit / test-crypto-pbkdf      OK      2.35s   17 subtests passed

Fixes: ebe0302ac8 ("tests/unit: build pbkdf test on macOS")
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
1 file changed