[hadrian] HEAD link failure

[Shayne Fletcher]

Building `HEAD` just now with `hadrian/build-stack --flavour=quickest -j`,
I get a link failure for stage1 `bin/ghc`:
```
ld: library not found for -lHSrts-1.0_thr_l
```
I'll try another flavour or something but in the meantime is this ringing
any bells?

-- 
Shayne Fletcher
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