Log Message:
devel/cabal-fmt: Update to 0.1.9
Also remove buildlink3.mk as it exposes no public modules.

0.1.9
* Change how version ranges with carets are formatted once again. Now
  ^>=1.2 || ^>=1.3 won't be changed anymore.

0.1.8
* Order extensions lexicographically

0.1.7
* Use Cabal-syntax-3.10.1.0