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/by-name/fl/flexcpp/package.nix

@@ -43,7 +43,7 @@ stdenv.mkDerivation rec {
     ./build install x
   '';
 
-  meta = with lib; {
+  meta = {
     description = "C++ tool for generating lexical scanners";
     mainProgram = "flexc++";
     longDescription = ''
@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
       option.
     '';
     homepage = "https://fbb-git.github.io/flexcpp/";
-    license = licenses.gpl3;
-    platforms = platforms.linux;
+    license = lib.licenses.gpl3;
+    platforms = lib.platforms.linux;
   };
 }