Disabling http tests for guix

[fredmanglis via digitalmars-d-ldc]

Hi.

I'm packaging ldc-1.1.0-beta6 for guix, which does not allow for 
network access when building the package, leading to errors, and 
timeouts when the tests are run.

Is there a way to deactivate such tests, say a flag passed to the 
build system or such? I would be grateful if you'd point me to 
one.

In the meantime, I have had to make use of huge patches to 
deactivate the tests to make the builds pass, which does not seem 
sustainable