stdenv/check-meta: Inherit remaining lib access into scope

Hopefully this will result in people not adding new `lib.xxx` to check-meta.nix.

pkgs/stdenv/generic/check-meta.nix

@@ -31,6 +31,14 @@ let
     toList
     isList
     elem
+    ;
+
+  inherit (lib.meta)
+    availableOn
+  ;
+
+  inherit (lib.generators)
+    toPretty
   ;
 
   # If we're in hydra, we can dispense with the more verbose error
@@ -86,7 +94,7 @@ let
     # was `licenses: lib.lists.any (l: !l.free or true) licenses;`
     # which always evaluates to `!true` for strings.
     else if isString licenses then false
-    else lib.lists.any (l: !l.free or true) licenses;
+    else any (l: !l.free or true) licenses;
 
   hasUnfreeLicense = attrs: hasLicense attrs && isUnfree attrs.meta.license;
 
@@ -96,7 +104,7 @@ let
   isMarkedBroken = attrs: attrs.meta.broken or false;
 
   hasUnsupportedPlatform =
-    pkg: !(lib.meta.availableOn hostPlatform pkg);
+    pkg: !(availableOn hostPlatform pkg);
 
   isMarkedInsecure = attrs: (attrs.meta.knownVulnerabilities or []) != [];
 
@@ -366,7 +374,7 @@ let
         [ ]
       else
         [ "key 'meta.${k}' has invalid value; expected ${metaTypes.${k}.name}, got\n    ${
-          lib.generators.toPretty { indent = "    "; } v
+          toPretty { indent = "    "; } v
         }" ]
     else
       [ "key 'meta.${k}' is unrecognized; expected one of: \n  [${concatMapStringsSep ", " (x: "'${x}'") (attrNames metaTypes)}]" ];
@@ -416,7 +424,7 @@ let
     else if !allowBroken && attrs.meta.broken or false then
       { valid = "no"; reason = "broken"; errormsg = "is marked as broken"; }
     else if !allowUnsupportedSystem && hasUnsupportedPlatform attrs then
-      let toPretty = lib.generators.toPretty {
+      let toPretty = toPretty {
             allowPrettyValues = true;
             indent = "  ";
           };