pager_query does not work when there is whitespace in query

pager_query does not work when there is whitespace before the SELECT. Could be fixed by changing the regex from:

'/SELECT.*?FROM/As', '/ORDER BY .*/'

to:

'/ *SELECT.*?FROM/As', '/ORDER BY .*/'

or by putting a trim() around $query.

This bug also seems to be present in HEAD: http://api.drupal.org/api/HEAD/function/pager_query