Merge pull request #17434 from matthewbauer/patch-6

acct: only build on linux

pkgs/tools/system/acct/default.nix

···
     homepage = http://www.gnu.org/software/acct/;
 
     maintainers = with maintainers; [ pSub ];
-    platforms = with platforms; allBut cygwin;
+    platforms = platforms.linux;
   };
 }