Disable dub from checking internet before building

[Benjamin Schaaf]

On Sunday, 24 February 2019 at 22:51:45 UTC, 0xFFFFFFFF wrote:
> How to disable dub from checking internet before building, it's 
> slowing down build whenever it does this.

Its not too well described but --nodeps skips dependency 
resolution (just uses the locked dependencies). Since dub only 
does requests for dependency resolution this stops any requests.