dev: add files to manifest ignore list

- compile_commands should been included in 464f8d4
- gumbo fuzzer files should have been included in #3007 and #3093

rakelib/check-manifest.rake

@@ -55,6 +55,8 @@ task :check_manifest, [:verbose] do |_, args|
     [a-z]*.{log,out}
     [0-9]*
     appveyor.yml
+    **/compile_commands.json
+    gumbo-parser/fuzzer/*
     gumbo-parser/test/*
     gumbo-parser/gperf-filter.sed
     lib/nokogiri/**/nokogiri.{jar,so}