Nicer error message (again) for Data(contentsOf:) + http

[stefanspringer1]

When getting data via Data(contentsOf:) and using an http-URL on Linux and Windows and not using the (conditional) import FoundationNetworking, the error message (with e.g. Swift 6.1.1) is

The specified URL type isn’t supported.

whereas with Swift 5.10 (tested on Linux) you got the message

Fatal error: You must link or load module FoundationNetworking to load non-file: URL content using String(contentsOf:…), Data(contentsOf:…), etc

which was so much nicer because it gave you a hint what to do.

The old error message should be used again.

[parkera]

Yes, with the split of Data into FoundationEssentials, this now throws here.

[parkera]

A fatalError doesn't seem right, but we could put the info about linking FoundationNetworking into the debug description of the error at that line.