Update $_old_files for 4.8

[ocean90]

tinymce/plugins/wpembed is missing for [40019].

[ocean90]

@azaozz @jorbin How does 40942.patch​ look to you?

[azaozz]

40942.patch looks good, +1 for commit.

[ocean90]

@azaozz Sorry, 40942.2.patch​ is all what we need here. We're using $wp_filesystem->delete($old_file, true);, so delete() is called in recursive mode.

[jorbin]

@ocean90 Should there be a comment just in case we stop recursive mode one day?

[ocean90]

@jorbin Where'd you place the comment? It's not the first directory in that array.

[jorbin]

Fair point. Let's commit 40942.2.patch

[ocean90]

In 40879:

Upgrade: Add wp-includes/js/tinymce/plugins/wpembed to $_old_files.

See #39513.
Fixes #40942.

[ocean90]

In 40880:

Upgrade: Add wp-includes/js/tinymce/plugins/wpembed to $_old_files.

Merge of [40879] to the 4.8 branch.

See #39513, #40942.