Keep info/#{f.name}/dir files in cleaner

Still cleans `info/dir` and `info/<arch>/dir` files.

Fixes https://github.com/Homebrew/homebrew-core/issues/100190

Library/Homebrew/cleaner.rb

@@ -31,7 +31,7 @@ class Cleaner
     # Get rid of any info 'dir' files, so they don't conflict at the link stage
     Dir.glob(@f.info/"**/dir").each do |f|
       info_dir_file = Pathname(f)
-      observe_file_removal info_dir_file if info_dir_file.file? && !@f.skip_clean?(info_dir_file)
+      observe_file_removal info_dir_file if info_dir_file.file? && info_dir_file != Pathname("#{@f.info}/#{@f.name}/dir") && !@f.skip_clean?(info_dir_file)
     end
 
     rewrite_shebangs

Library/Homebrew/test/cleaner_spec.rb

@@ -136,6 +136,26 @@ describe Cleaner do
 
       expect(file).not_to exist
     end
+
+    it "removes 'info/**/dir' files except for 'info/<name>/dir'" do
+      file = f.info/"dir"
+      arch_file = f.info/"i686-elf/dir"
+      name_file = f.info/"#{f.name}/dir"
+
+      f.info.mkpath
+      (f.info/"i686-elf").mkpath
+      (f.info/"#{f.name}").mkpath
+
+      touch file
+      touch arch_file
+      touch name_file
+
+      cleaner.clean
+
+      expect(file).not_to exist
+      expect(arch_file).not_to exist
+      expect(name_file).to exist
+    end
   end
 
   describe "::skip_clean" do