sync: relax rollup config for imperfect deps (#3977)
sync: relax rollup config for imperfect deps (#3977)

Projector depends on Weblas, a 3rd party dependency that throws runtime
errors when run in a browser's strict mode:
https://github.com/waylonflinn/weblas/issues/52

To workaround the error, this changes our Rollup config to generate output
files in non-strict mode.  Manually checked that the standalone target now
works (errored with `p is not defined` before):

`blaze run tensorboard/plugins/projector/polymer3/vz_projector:standalone`
tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard