Disable perl 5.16 tests

They are on the path to stdenv rebuild.

Accidentally re-enabled by conflict resolution in cherry-pick 3196d4f.

pkgs/development/interpreters/perl/5.16/default.nix

@@ -85,31 +85,5 @@ stdenv.mkDerivation rec {
 
   setupHook = ./setup-hook.sh;
 
-  doCheck = !stdenv.isDarwin;
-
-  # some network-related tests don't work, mostly probably due to our sandboxing
-  # man-heading.t is skipped due to output determinism (no dates)
-  testsToSkip = ''
-    lib/Net/hostent.t \
-    dist/IO/t/{io_multihomed.t,io_sock.t} \
-    dist/Net-Ping/t/*.t \
-    cpan/autodie/t/truncate.t \
-    t/porting/{maintainers.t,regen.t} \
-    cpan/Socket/t/get{name,addr}info.t \
-    cpan/podlators/t/man-heading.t \
-  '' + optionalString stdenv.isFreeBSD ''
-    cpan/CPANPLUS/t/04_CPANPLUS-Module.t \
-    cpan/CPANPLUS/t/20_CPANPLUS-Dist-MM.t \
-  '' + " ";
-
-  postPatch = optionalString (!stdenv.isDarwin) /* this failed on Darwin, no idea why */ ''
-    for test in ${testsToSkip}; do
-      echo "Removing test" $test
-      rm "$test"
-      pat=`echo "$test" | sed 's,/,\\\\/,g'` # just escape slashes
-      sed "/^$pat/d" -i MANIFEST
-    done
-  '';
-
   passthru.libPrefix = "lib/perl5/site_perl";
 }