Merge pull request #5209 from shuujii/remove-build-presym.inc-by-rake-clean

Remove `build/presym{,.inc}` by `rake clean` [ci skip]

Rakefile

@@ -278,6 +278,8 @@ task :clean do
     rm_rf t.build_dir
   end
   rm_f depfiles
+  rm_f presym_file
+  rm_f presym_inc
   puts "Cleaned up target build folder"
 end
 
@@ -286,7 +288,5 @@ task :deep_clean => ["clean", "clean_doc"] do
   MRuby.each_target do |t|
     rm_rf t.gem_clone_dir
   end
-  rm_f presym_file
-  rm_f presym_inc
   puts "Cleaned up mrbgems build folder"
 end