Revert "tests.cc-wrapper.default: reduce rebuild amount from 429 to 319"

Now that we use a trivial shell script, this only adds two trivial
builds to the closure.

This reverts commit 5f2d5d77da.

pkgs/test/cc-wrapper/default.nix

@@ -8,7 +8,7 @@ let
     || (stdenv.cc.isGNU && stdenv.hostPlatform.isLinux)
   );
   staticLibc = lib.optionalString (stdenv.hostPlatform.libc == "glibc") "-L ${glibc.static}/lib";
-  emulator = lib.optionalString (!stdenv.buildPlatform.canExecute stdenv.hostPlatform) (stdenv.hostPlatform.emulator buildPackages);
+  emulator = stdenv.hostPlatform.emulator buildPackages;
   isCxx = stdenv.cc.libcxx != null;
   libcxxStdenvSuffix = lib.optionalString isCxx "-libcxx";
   CC = "PATH= ${lib.getExe' stdenv.cc "${stdenv.cc.targetPrefix}cc"}";