Dion Hulse 046ba97ee5 Upgrade: When deleting old files, if deletion fails attempt to empty the file instead.
Props joemcgill, dd32.
Merges [42434] to the 3.9 branch.
Fixes #42963 for 3.9.

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git-svn-id: http://core.svn.wordpress.org/branches/3.9@42304 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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