Dion Hulse 5973b3a5e1 Upgrade: When deleting old files, if deletion fails attempt to empty the file instead.
Props joemcgill, dd32.
Merges [42433] to the 4.9 branch.
Fixes #42963 for 4.9.

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git-svn-id: http://core.svn.wordpress.org/branches/4.9@42264 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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