Build Bazel releases with Xcode 10.2.1 (#873)
Build Bazel releases with Xcode 10.2.1 (#873)

This is the easiest solution for https://github.com/bazelbuild/bazel/issues/10297.

If we can figure out how to set a deployment target when building with newer Xcode versions, we can switch to that instead.
bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration