[test][Reflection] reflect_Enum_values_resilient: upload resilient_enums.dylib for remote-run
The test binary links libresilient_enums.dylib with an
@executable_path/libresilient_enums.dylib install_name. Under
remote-run, the dylib needs to be uploaded next to the binary for
that to resolve. remote-run only rsyncs files whose paths appear as
a whole argv slot or as a REMOTE_RUN_CHILD_* env-var value (substring
matches don't count), so the dylib has to be referenced somewhere on
the command line in one of those positions.
swift-reflection-test rejects extra positional args, so we can't
simply append the dylib path. Wrapping in 'sh -c' would work but
breaks on iOS where /bin/sh isn't reliably available. Instead, set
a dummy %env-_EXTRA_DYLIB env var to the dylib path: remote-run's
EnvVarProcessor runs every REMOTE_RUN_CHILD_* value through the same
upload logic as argv, so the dylib gets rsynced. The env var itself
is inert in the remote process.