[5.8] Let mix helper use assets url

[themsaid]

No description provided.

[GrahamCampbell]

Is this not a breaking change?

[timrspratt]

For HTML <script> and <link>, I currently use asset(mix(...)), which detects a valid URL and so all is fine. But I also have use cases for mix() with Spaties SSR package. This creates a local file path and so results in the error:

Server script at path `/var/www/current/public/https://XXXXX.cloudfront.net/js/entry-server.js` doesn't exist"

Is this likely to be reverted, or should I account for it / submit a PR to Spaties package to remove the host from the string?

Thanks

[GrahamCampbell]

I will have the exact same error if I upgrade to the latest patch release, too.