Fix mangled image output in compat function.

props wonderboymusic. see #24175.

git-svn-id: http://core.svn.wordpress.org/trunk@24078 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Allow the_post_format_image() to choose an image size late in the game.

props davidwilliamson, SergeyBiryukov. fixes #23945.

git-svn-id: http://core.svn.wordpress.org/trunk@24079 1a063a9b-81f0-0310-95a4-ce76da25c4cd