haskellPackages.inline-asm: restrict to x86

Main executable uses x86 assembler, so we can't build it anywhere at
all.

pkgs/development/haskell-modules/configuration-nix.nix

@@ -794,8 +794,8 @@ self: super: builtins.intersectAttrs super {
     ] ++ (drv.librarySystemDepends or []);
   });
 
-  # test suite uses x86 assembler
+  # uses x86 assembler
   inline-asm = overrideCabal super.inline-asm {
-    doCheck = pkgs.stdenv.hostPlatform.isx86;
+    platforms = pkgs.lib.platforms.isx86;
   };
 }