Cloning this repository fails unless the remote is named 'origin'

[kpfleming]

When cloning repositories where the fork-and-PR module is used for submissions, I typically name the remote 'upstream', like this:

git clone -o upstream --recurse-submodules github.com:fastly/js-compute-runtime

With this repository, that fails when trying to initialize the StarlingMonkey submodule, as there is some sort of internal reference which copies the remote name from the outer repository. Cloning works fine if I don't rename the remote and use the default of origin.

This is in addition to the StarlingMonkey submodule requiring the file transport for Git to be enabled, which is not ideal since it is a security risk.