Update bazel_apple_test to run on XCode 9.
Fixes
@@ -37,7 +37,7 @@ function set_up() {
--output xml | grep 'name="version"' \
| sed -E 's/.*(value=\"(([0-9]|.)+))\".*/\2/' > xcode_versions
- XCODE_VERSION=$(cat xcode_versions | grep -m1 '7\|8')
+ XCODE_VERSION=$(cat xcode_versions | grep -m1 '7\|8\|9')
# Allow access to //external:xcrunwrapper.
use_bazel_workspace_file
