Eliminate the use of `extract()` in `wp_validate_auth_cookie()`. 

Don't do anything fancy here, just set the 4 returned properties to variables. This function is semi-important.
	
See #22400.

Built from https://develop.svn.wordpress.org/trunk@28424


git-svn-id: http://core.svn.wordpress.org/trunk@28251 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate the use of `extract()` in `wp_mail()`. Check the filtered array for each value before re-setting variables.

See #22400.

Built from https://develop.svn.wordpress.org/trunk@28425


git-svn-id: http://core.svn.wordpress.org/trunk@28252 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate the use of `extract()` in `wp_check_filetype_and_ext()`.

See #22400.

Built from https://develop.svn.wordpress.org/trunk@28426


git-svn-id: http://core.svn.wordpress.org/trunk@28253 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate the use of `extract()` in `wp_update_comment()`. All unit tests pass.

See #22400.

Built from https://develop.svn.wordpress.org/trunk@28427


git-svn-id: http://core.svn.wordpress.org/trunk@28254 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate the use of `extract()` in `wp_list_comments()`. All unit tests pass.

See #22400.

Built from https://develop.svn.wordpress.org/trunk@28428


git-svn-id: http://core.svn.wordpress.org/trunk@28255 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate the use of `extract()` in `get_post_reply_link()`.

See #22400.

Built from https://develop.svn.wordpress.org/trunk@28429


git-svn-id: http://core.svn.wordpress.org/trunk@28256 1a063a9b-81f0-0310-95a4-ce76da25c4cd