fall back to copy + unlink on EPERM

  [Feature #15415][ruby-core:90536]

  Co-authored-by: Eric Wong  <normalperson@yhbt.net>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67212 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: hsbt

lib/fileutils.rb

@@ -529,7 +529,8 @@ def mv(src, dest, force: nil, noop: nil, verbose: nil, secure: nil)
         end
         begin
           File.rename s, d
-        rescue Errno::EXDEV
+        rescue Errno::EXDEV,
+               Errno::EPERM # move from unencrypted to encrypted dir (ext4)
           copy_entry s, d, true
           if secure
             remove_entry_secure s, force