Eliminate the use of `extract()` in `WP_Tax_Query::get_sql()`. All unit tests still pass.
	
See #22400.


git-svn-id: https://develop.svn.wordpress.org/trunk@28422 602fd350-edb4-49c9-b593-d223f7449a82
Eliminate the use of `extract()` in `get_objects_in_term()`. Only one property (`order`) was extracted.
	
See #22400.


git-svn-id: https://develop.svn.wordpress.org/trunk@28423 602fd350-edb4-49c9-b593-d223f7449a82