MB-12867: Declare Breakpad as a dependency

Append the cbdeps version of Breakpad as a dependency in
manifest.cmake to allow for its use in main line builds

Change-Id: Ibd93491e0e35fe1433f9d582601f1579e75c2188
Reviewed-on: http://review.couchbase.org/44429
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: David Haikney <david.haikney@couchbase.com>