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/spl/const.patch

@@ -1,13 +0,0 @@
-diff --git a/module/spl/spl-proc.c b/module/spl/spl-proc.c
-index eb00505..6f38cef 100644
---- a/module/spl/spl-proc.c
-+++ b/module/spl/spl-proc.c
-@@ -36,7 +36,7 @@
- #include <linux/uaccess.h>
- #include <linux/version.h>
- 
--#if defined(CONSTIFY_PLUGIN) && LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)
-+#if defined(CONSTIFY_PLUGIN)
- typedef struct ctl_table __no_const spl_ctl_table;
- #else
- typedef struct ctl_table spl_ctl_table;

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

@@ -20,7 +20,7 @@ let
         inherit rev sha256;
       };
 
-      patches = [ ./const.patch ./install_prefix.patch ];
+      patches = [ ./install_prefix.patch ];
 
       nativeBuildInputs = [ autoreconfHook ] ++ kernel.moduleBuildDependencies;
 
@@ -61,8 +61,8 @@ in
   assert kernel != null;
 {
     splStable = common {
-      version = "0.7.6";
-      sha256 = "1l641d89k48ngmarx9mxh8gw2zzrf7fw7n8zmslhz4h1152plddb";
+      version = "0.7.7";
+      sha256 = "0mq7827x4173wdbpj361gvxvk8j9r96363gka75smzsc31i2wa5x";
     };
 
     splUnstable = common {