Add os-string Cabal flag for unix

mpilgrem · mpilgrem · commit 31f9e849a6e4 · 2024-07-15T10:50:06.000+01:00
diff --git a/stack-ghc-9.10.1.yaml b/stack-ghc-9.10.1.yaml
@@ -49,3 +49,5 @@ flags:
     os-string: true
   stack:
     developer-mode: true
+  unix:
+    os-string: true
