has_privs() doesn't query DB if unnecessary.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5349 2fea6a4d-a838-0410-917b-93a53c48e9d2
has_privs() uses strict comparison w/ whitespace support.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5350 2fea6a4d-a838-0410-917b-93a53c48e9d2