[vscode][workspace] remove build-* from the workspace

This might cause problems if trying to find config.h or whatnot, so may
end up rolling it back.

lk.code-workspace

@@ -21,7 +21,8 @@
         "editor.tabSize": 4,
         "files.exclude": {
             "**/.cache": true,
-            "**/.clangd": true
+            "**/.clangd": true,
+            "build-*": true,
         }
     },
     "extensions": {