Mark Herzlich makes the Giants; Rosenfels to I.R.

Cancer survivor Mark Herzlich didn’t get drafted, but he did something more important on Saturday. He didn’t get cut. The former Boston College Eagle was one of four rookie linebackers to make the Giants’ initial 53-man roster.  The other three: Greg Jones, Jacquain Williams, and Spencer Paysinger. The other big news from the Giants: backup…