llvmPackages_{12,13,14,15,16,17,18,19,20,git}.lldb: move into lldb directory

pkgs/development/compilers/llvm/common/default.nix

···
         lib.recurseIntoAttrs { llef = callPackage ./lldb-plugins/llef.nix { }; }
       );
 
-      lldb = callPackage ./lldb.nix (
+      lldb = callPackage ./lldb (
         {
         }
         // lib.optionalAttrs (lib.versions.major metadata.release_version == "16") {

pkgs/development/compilers/llvm/common/lldb.nix pkgs/development/compilers/llvm/common/lldb/default.nix

···
       ++ lib.optional (lib.versionOlder release_version "14") (
         getVersionFile "lldb/gnu-install-dirs.patch"
       )
-      ++ lib.optional (lib.versionAtLeast release_version "14") ./lldb/gnu-install-dirs.patch;
+      ++ lib.optional (lib.versionAtLeast release_version "14") ./gnu-install-dirs.patch;
 
     nativeBuildInputs =
       [