Troubleshooting DUB invocations

[Dukc via Digitalmars-d-learn]

When trying to compile a project including newest Spasm (DUB 
package) using the newest LDC via DUB, the result is:
```
lld: error: unknown argument: --no-as-needed
```
I then ran DUB with -v switch and it turned out the invocation 
contained `-L--no-as-needed` as first of all the -L arguments. 
The trouble is, how do I know what causes DUB to add that 
argument to the invocation? I could find no reason in 
`dub.<json/sdl>` files of either my package, Spasm or any package 
in Spasm dependency tree.