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.

pkgs/development/compilers/chicken/default.nix

@@ -63,7 +63,7 @@ stdenv.mkDerivation {
     homepage = http://www.call-cc.org/;
     license = stdenv.lib.licenses.bsd3;
     maintainers = with stdenv.lib.maintainers; [ the-kenny ];
-    platforms = with stdenv.lib.platforms; allBut darwin;
+    platforms = stdenv.lib.platforms.linux; # Maybe other non-darwin Unix
     description = "A portable compiler for the Scheme programming language";
     longDescription = ''
       CHICKEN is a compiler for the Scheme programming language.