Add cabal.project (#566)

sjakobi · web-flow · commit 4ddd36090f40 · 2025-11-30T13:30:15.000+01:00
`-msse4.2` shouldn't cause any problems on any reasonably modern
systems.
diff --git a/cabal.project b/cabal.project
@@ -0,0 +1,4 @@
+packages: ./*.cabal
+
+package unordered-containers
+  ghc-options: -msse4.2
