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/development/libraries/ffmpeg/generic.nix

@@ -1037,7 +1037,7 @@ stdenv.mkDerivation (
 
     passthru.tests.pkg-config = testers.testMetaPkgConfig finalAttrs.finalPackage;
 
-    meta = with lib; {
+    meta = {
       description = "Complete, cross-platform solution to record, convert and stream audio and video";
       homepage = "https://www.ffmpeg.org/";
       changelog = "https://github.com/FFmpeg/FFmpeg/blob/n${version}/Changelog";
@@ -1049,7 +1049,7 @@ stdenv.mkDerivation (
         a corporation.
       '';
       license =
-        with licenses;
+        with lib.licenses;
         [ lgpl21Plus ]
         ++ optional withGPL gpl2Plus
         ++ optional withVersion3 lgpl3Plus
@@ -1067,10 +1067,10 @@ stdenv.mkDerivation (
         ++ optional buildPostproc "libpostproc"
         ++ optional buildSwresample "libswresample"
         ++ optional buildSwscale "libswscale";
-      platforms = platforms.all;
+      platforms = lib.platforms.all;
       # See https://github.com/NixOS/nixpkgs/pull/295344#issuecomment-1992263658
       broken = stdenv.hostPlatform.isMinGW && stdenv.hostPlatform.is64bit;
-      maintainers = with maintainers; [
+      maintainers = with lib.maintainers; [
         atemu
         jopejoe1
         emily