There aren’t many movies that advertise themselves as treatises on masculine love. Look hard, however, and you can find them. Try as it might, “Secondhand Lions” (2003) isn’t one of those wistful, sepia-toned, “written and directed by” pieces of sugar candy that help one pass a lazy Sunday afternoon. It isn’t simply two feral geezers and an abandoned kid trying to figure each other out in rural 1960s Somewhere. It helps that Michael Caine, Robert Duvall and Haley Joel Osment are the principals, but underneath the tall-tale bluster, there’s a heart to this film, and it’s shared by those three.