CNBC's Jim Cramer on Thursday reviewed recent earnings reports from major homebuilders Lennar and KB Home, expressing concern that the Federal Reserve's rate cuts won't help bring down mortgage rates."I think it's better to take a wait-and-see approach to the homebuilders, just in case we see a repeat of last fall, where the Fed started cutting and it didn't make a difference," he said. "If anything, it drove the bond market in the wrong direction and mortgage rates higher."The Fed lowered its benchmark bor ...