zfs, spl: 0.7.6 -> 0.7.7

Remove spl patch that was introduced for grsecurity which we don't support
anymore. ZFS now needs perl for some scripts that are call in the configure
script.

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

@@ -1,4 +1,5 @@
-{ stdenv, fetchFromGitHub, autoreconfHook, utillinux, nukeReferences, coreutils, fetchpatch
+{ stdenv, fetchFromGitHub, autoreconfHook, utillinux, nukeReferences, coreutils
+, perl, fetchpatch
 , configFile ? "all"
 
 # Userspace dependencies
@@ -39,8 +40,12 @@ let
 
       patches = extraPatches;
 
+      postPatch = optionalString buildKernel ''
+        patchShebangs scripts
+      '';
+
       nativeBuildInputs = [ autoreconfHook nukeReferences ]
-         ++ optional buildKernel kernel.moduleBuildDependencies;
+         ++ optional buildKernel (kernel.moduleBuildDependencies ++ [ perl ]);
       buildInputs =
            optionals buildKernel [ spl ]
         ++ optionals buildUser [ zlib libuuid python attr ]
@@ -142,9 +147,9 @@ in {
     incompatibleKernelVersion = null;
 
     # this package should point to the latest release.
-    version = "0.7.6";
+    version = "0.7.7";
 
-    sha256 = "1k3a69zfdk4ia4z2l69lbz0mj26bwdanxd2wynkdpm2kl3zjj18h";
+    sha256 = "0lrzy27sh1cinkf04ki2vfjrgpgbiza2s59i2by45qdd8kmkcc5r";
 
     extraPatches = [
       (fetchpatch {