docker: keep using btrfs-progs 4.4.1

Fixes https://hydra.nixos.org/build/33510211.

pkgs/tools/filesystems/btrfs-progs/4.4.1.nix

···
+{ stdenv, fetchurl, pkgconfig, attr, acl, zlib, libuuid, e2fsprogs, lzo
+, asciidoc, xmlto, docbook_xml_dtd_45, docbook_xsl, libxslt
+}:
+
+let version = "4.4.1"; in
+
+stdenv.mkDerivation rec {
+  name = "btrfs-progs-${version}";
+
+  src = fetchurl {
+    url = "mirror://kernel/linux/kernel/people/kdave/btrfs-progs/btrfs-progs-v${version}.tar.xz";
+    sha256 = "1z5882zx9jx02vyg067siws0irsl8pg37myx17hr4imn9ypf6r4r";
+  };
+
+  buildInputs = [
+    pkgconfig attr acl zlib libuuid e2fsprogs lzo
+    asciidoc xmlto docbook_xml_dtd_45 docbook_xsl libxslt
+  ];
+
+  # gcc bug with -O1 on ARM with gcc 4.8
+  # This should be fine on all platforms so apply universally
+  patchPhase = "sed -i s/-O1/-O2/ configure";
+
+  meta = with stdenv.lib; {
+    description = "Utilities for the btrfs filesystem";
+    homepage = https://btrfs.wiki.kernel.org/;
+    license = licenses.gpl2;
+    maintainers = with maintainers; [ nckx raskin wkennington ];
+    platforms = platforms.linux;
+  };
+}

pkgs/top-level/all-packages.nix

···
   dmtx-utils = callPackage (callPackage ../tools/graphics/dmtx-utils) {
   };
 
-  docker = callPackage ../applications/virtualization/docker { go = go_1_4; };
+  docker = callPackage ../applications/virtualization/docker {
+    btrfs-progs = callPackage ../tools/filesystems/btrfs-progs/4.4.1.nix { };
+    go = go_1_4;
+  };
 
   docker-gc = callPackage ../applications/virtualization/docker/gc.nix { };