overlay/zstd: do not build tests

overlay/default.nix

@@ -247,4 +247,19 @@ in nullPkgs // {
     '';
   }) zlib;
 
+  zstd = let
+    static = true;
+    legacySupport = false;
+  in overrideAttrsHost (attrs: rec {
+    cmakeFlags = lib.attrsets.mapAttrsToList
+      (name: value: "-DZSTD_${name}:BOOL=${if value then "ON" else "OFF"}") {
+        BUILD_SHARED = !static;
+        BUILD_STATIC = static;
+        PROGRAMS_LINK_SHARED = !static;
+        LEGACY_SUPPORT = legacySupport;
+        BUILD_TESTS = doCheck;
+      };
+    doCheck = stdenv.hostPlatform == stdenv.buildPlatform;
+  }) prev.zstd;
+
 }