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.


git-svn-id: https://develop.svn.wordpress.org/trunk@28424 602fd350-edb4-49c9-b593-d223f7449a82
Eliminate the use of `extract()` in `wp_mail()`. Check the filtered array for each value before re-setting variables.

See #22400.


git-svn-id: https://develop.svn.wordpress.org/trunk@28425 602fd350-edb4-49c9-b593-d223f7449a82