Revert "lz4: 131 -> 1.7.3"

This reverts commit 1f0a12ee8d.
Systemd build was broken and such change should probably go through
staging anyway.

pkgs/tools/compression/lz4/default.nix

@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name = "lz4-${version}";
-  version = "1.7.3";
+  version = "131";
 
   src = fetchFromGitHub {
-    sha256 = "0b9yhgiqsdaqgq03vkgalrpbbw7p9a8n8j1nqipra5vw182jrvl0";
-    rev = "v${version}";
+    sha256 = "1bhvcq8fxxsqnpg5qa6k3nsyhq0nl0iarh08sqzclww27hlpyay2";
+    rev = "r${version}";
     repo = "lz4";
     owner = "Cyan4973";
   };
@@ -22,6 +22,8 @@ stdenv.mkDerivation rec {
   doCheck = false; # tests take a very long time
   checkTarget = "test";
 
+  patches = [ ./install-on-freebsd.patch ] ;
+
   postInstall = "rm $out/lib/*.a";
 
   meta = with stdenv.lib; {