vimPlugins.codesnap-nvim: fix binary substitution

pkgs/applications/editors/vim/plugins/overrides.nix

@@ -436,11 +436,15 @@
       pname = "codesnap.nvim";
       inherit version src;
 
+      # - Remove the shipped pre-built binaries
+      # - Copy the resulting binary from the codesnap-lib derivation
+      # Note: the destination should be generator.so, even on darwin
       # https://github.com/mistricky/codesnap.nvim/blob/main/scripts/build_generator.sh
       postInstall = let
         extension = if stdenv.isDarwin then "dylib" else "so";
       in ''
-        cp ${codesnap-lib}/lib/libgenerator.${extension} lua/generator.so
+        rm -r $out/lua/*.so
+        cp ${codesnap-lib}/lib/libgenerator.${extension} $out/lua/generator.so
       '';
 
       doInstallCheck = true;