Eliminate one of the uses of `extract()` in `wp_handle_sideload()`.
	
See #22400.

Built from https://develop.svn.wordpress.org/trunk@28416


git-svn-id: http://core.svn.wordpress.org/trunk@28243 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate one of the uses of `extract()` in `wp_handle_upload()`.
	
See #22400.

Built from https://develop.svn.wordpress.org/trunk@28417


git-svn-id: http://core.svn.wordpress.org/trunk@28244 1a063a9b-81f0-0310-95a4-ce76da25c4cd