treewide: get rid of platforms.allBut

Negative reasoning like `allBut` is a bad idea with an open world of
platforms. Concretely, if we add a new, quite different sort of
platform, existing packages with `allBut` will claim they work on it
even though they probably won't.

1 files changed, 1 insertions, 1 deletions

diff --git a/pkgs/misc/screensavers/alock/default.nix b/pkgs/misc/screensavers/alock/default.nix
index 1dc03e1e9f03..5b7c12dee1b0 100644
--- a/pkgs/misc/screensavers/alock/default.nix
+++ b/pkgs/misc/screensavers/alock/default.nix
@@ -38,7 +38,7 @@ stdenv.mkDerivation rec {
       xscreensaver and never will. It's just for locking the current
       X session.
     '';
-    platforms = with platforms; allBut cygwin;
+    platforms = platforms.unix; # Cygwin had problems at one point
     maintainers = with maintainers; [ ftrvxmtrx chris-martin ];
   };
 }