Revert "linux: patch CVE-2017-1000364 (stack clash)"

This reverts commit aab71b31d5030bea94804d3677a3ffbc60e1876a.

This was integrated into the stable 4.9 and 4.11 kernels.

pkgs/os-specific/linux/kernel/patches.nix

···
         sha256 = "10dmv3d3gj8rvj9h40js4jh8xbr5wyaqiy0kd819mya441mj8ll2";
       };
     };
-
-  # CVE-2017-1000364 (stack clash)
-  mm_larger_stack_guard_gap_4_9 = rec
-    { name = "mm-larger-stack-guard-gap-between-vmas.patch";
-      patch = fetchpatch {
-        inherit name;
-        url = "https://anonscm.debian.org/cgit/kernel/linux.git/plain/debian/patches/bugfix/all/mm-enlarge-stack-guard-gap.patch?h=debian/4.9.30-2%2bdeb9u1_bpo8%2b1";
-        sha256 = "0bl7w1zgcy691avp54p6mvzdam6snrb7pz3hywsf2g2mcxjkyja5";
-      };
-    };
-
-  mm_larger_stack_guard_gap_4_11 = rec
-    { name = "mm-larger-stack-guard-gap-between-vmas.patch";
-      patch = fetchpatch {
-        inherit name;
-        url = "https://anonscm.debian.org/cgit/kernel/linux.git/plain/debian/patches/bugfix/all/mm-larger-stack-guard-gap-between-vmas.patch?h=debian/4.11.6-1";
-        sha256 = "19bakn3119v5jkhh4w7x3d50py9an1w8h7v3mmy7y2l2agj4mn3i";
-      };
-    };
 }

pkgs/top-level/all-packages.nix

···
         kernelPatches.p9_fixes
         kernelPatches.cpu-cgroup-v2."4.9"
         kernelPatches.modinst_arg_list_too_long
-        kernelPatches.mm_larger_stack_guard_gap_4_9
       ]
       ++ lib.optionals ((platform.kernelArch or null) == "mips")
       [ kernelPatches.mips_fpureg_emu
···
         # when adding a new linux version
         kernelPatches.cpu-cgroup-v2."4.11"
         kernelPatches.modinst_arg_list_too_long
-        kernelPatches.mm_larger_stack_guard_gap_4_11
       ]
       ++ lib.optionals ((platform.kernelArch or null) == "mips")
       [ kernelPatches.mips_fpureg_emu