util_test: Specify libbsm link dependency properly

util_test: specify libbsm link dependency properly.

7dda7b322881 accidentally moved the libbsm.dylib dependency from
util_test_lib to util_test. It is only used by
test/mac/mach_multiprocess.cc in util_test_lib.

Meanwhile, util_test should link against Foundation.framework, which is
used by three tests in util/mac: launchd_test.mm, mac_util_test.mm, and
service_management_test.mm.

R=scottmg@chromium.org

Committed: https://chromium.googlesource.com/crashpad/crashpad/+/47f17926e4f3f1425a39732ae3ca60cc6fc5365d

[Mark Mentovai, 2014-10-02 21:32:09]

mark@chromium.org changed reviewers:
+ scottmg@chromium.org

[scottmg, 2014-10-02 21:42:05]

lgtm

[Mark Mentovai, 2014-10-02 22:32:38]

Committed patchset #1 (id:1) manually as
47f17926e4f3f1425a39732ae3ca60cc6fc5365d (presubmit successful).