PHILADELPHIA — Leave it to Howie Roseman to “target” a seventh-round pick. That’s exactly what the Eagles GM did on Saturday, maneuvering the board like a maestro to bet low on Nigerian super-athlete Uar Bernard with the 251st overall selection. Roseman didn’t even enter the draft weekend with a seventh-round pick. By Friday, he had acquired No. 244 overall — a throw-in from Minnesota in the blockbuster trade that sent Jonathan Greenard to Philadelphia for two third-round picks. As things advanced on Saturday, Roseman was set pick at No. 197 by curiously moved back 10 spots to acquire Nos. 251 and 252 from the Los Angeles Rams.  The Eagles GM was able to pick up some offensive line depth at 207 with powerful Georgia offensive guard Micah Morris, and use No. 244 on Texas Tech safety Cole Wisniewski, a player Roseman compared favorably to Reed Blankenship and the type of high-IQ veteran college player who could potentially push veterans Marcus Epps and Michael Carter on the back end.…