[Issue 20699] -lowmem does nothing with dmd if passed via dub

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20699

--- Comment #4 from JR <zorael at gmail.com> ---
Is there untractably much work involved?

I could really use -lowmem for CI builds where available memory is limited.
Alternatively a way to programmatically get the commands dub (supposedly)
performs, so I could just tack -lowmem onto there.

--