Disable checkMeta by default again.

This caused too many downstream projects to break, so we are reverting
this change for now, until further transition fixes are in place.

See discussion in https://github.com/NixOS/nixpkgs/pull/191171

This reverts part of 6762de9a28

nixos/doc/manual/from_md/release-notes/rl-2211.section.xml

@@ -503,14 +503,6 @@
           maintainer to update the package.
         </para>
       </listitem>
-      <listitem>
-        <para>
-          The (previously undocumented) Nixpkgs configuration option
-          <literal>checkMeta</literal> now defaults to
-          <literal>true</literal>. This may cause evaluation failures
-          for packages with incorrect <literal>meta</literal> attribute.
-        </para>
-      </listitem>
       <listitem>
         <para>
           xow package removed along with the

nixos/doc/manual/release-notes/rl-2211.section.md

@@ -172,9 +172,6 @@ Available as [services.patroni](options.html#opt-services.patroni.enable).
 
 - riak package removed along with `services.riak` module, due to lack of maintainer to update the package.
 
-- The (previously undocumented) Nixpkgs configuration option `checkMeta` now defaults to `true`. This may cause evaluation
-  failures for packages with incorrect `meta` attribute.
-
 - xow package removed along with the `hardware.xow` module, due to the project being deprecated in favor of `xone`,  which is available via the `hardware.xone` module.
 
 - dd-agent package removed along with the `services.dd-agent` module, due to the project being deprecated in favor of `datadog-agent`,  which is available via the `services.datadog-agent` module.

pkgs/top-level/config.nix

@@ -130,7 +130,7 @@ let
 
     checkMeta = mkOption {
       type = types.bool;
-      default = true;
+      default = false;
       description = ''
         Whether to check that the `meta` attribute of derivations are correct during evaluation time.
       '';