Fix the condition to remove `mrbtest` when `rake clean`
MODIFY
tasks/test.rake
tasks/test.rake
@@ -60,5 +60,6 @@ MRuby.each_target do |build|
end
task :clean do
- rm_f "#{MRuby::Build.install_dir}/mrbtest"
+ host = MRuby.targets["host"]
+ rm_f host.exefile("#{host.class.install_dir}/mrbtest") if host && host.test_enabled?
end

Fix the condition to remove `mrbtest` when `rake clean`