treewide: clean up 'meta = with' pattern

This commit was created by a combination of scripts and tools:
- an ast-grep script to prefix things in meta with `lib.`,
- a modified nixf-diagnose / nixf combination to remove unused `with
lib;`, and
- regular nixfmt.

Co-authored-by: Wolfgang Walther <walther@technowledgy.de>

pkgs/tools/text/diffutils/default.nix

@@ -72,11 +72,11 @@ stdenv.mkDerivation rec {
   # Test failure on QEMU only (#300550)
   doCheck = !stdenv.buildPlatform.isRiscV64;
 
-  meta = with lib; {
+  meta = {
     homepage = "https://www.gnu.org/software/diffutils/diffutils.html";
     description = "Commands for showing the differences between files (diff, cmp, etc.)";
-    license = licenses.gpl3;
-    platforms = platforms.unix;
+    license = lib.licenses.gpl3;
+    platforms = lib.platforms.unix;
     maintainers = lib.teams.helsinki-systems.members;
   };
 }