Fix installer under OS X

The installer was missing the StdRedirect.dylib after a recent change.
This was breaking the Tutorial job on ci.bazel.io (and iOS builds using
that installer).

--
MOS_MIGRATED_REVID=111855462

scripts/ci/build.sh

diff --git a/scripts/ci/build.sh b/scripts/ci/build.sh
index ac1d520..df7e794 100755
--- a/scripts/ci/build.sh
+++ b/scripts/ci/build.sh
@@ -167,10 +167,16 @@
   fi
 
   # Build the packages
+  local ARGS=
+  if [[ $PLATFORM == "darwin" ]] && \
+      xcodebuild -showsdks 2> /dev/null | grep -q '\-sdk iphonesimulator'; then
+    ARGS="--define IPHONE_SDK=1"
+  fi
   ./output/bazel --bazelrc=${BAZELRC:-/dev/null} --nomaster_bazelrc build \
       --embed_label=${release_label} --stamp \
       --workspace_status_command=scripts/ci/build_status_command.sh \
       --define JAVA_VERSION=${JAVA_VERSION} \
+      ${ARGS} \
       //scripts/packages/... || exit $?
 
   if [ -n "${1-}" ]; then