apparmor: fix build by using older perl

This is work around #5270.
Also bogus path in wrapper got fixed.

CC: maintainers @phreedom, @thoughtpolice.
It would be better to test this as well by someone who actually uses it.

pkgs/os-specific/linux/apparmor/default.nix

@@ -77,9 +77,13 @@ stdenv.mkDerivation rec {
     cd ..
     cp -r  kernel-patches $out
   '';
-  installPhase = ''
+
+  installPhase = let
+    perlVersion = (builtins.parseDrvName perl.name).version;
+  in ''
     for i in $out/bin/*;  do
-      wrapProgram $i --prefix PERL5LIB : "$PERL5LIB:$out/lib/perl5/5.10.1/i686-linux-thread-multi/"
+      wrapProgram $i --prefix PERL5LIB : \
+        "$PERL5LIB:$out/lib/perl5/${perlVersion}/${stdenv.system}-thread-multi/"
     done
   '';