Nikkei gains more than 1 pct; automakers up on strong U.S. sales, weak yen

* Nissan outperforms peers after posting outstanding U.S. sales * Construction stocks attract buy on strong domestic demand hope By Ayai Tomisawa TOKYO, July 2 (Reuters) - Japan's Nikkei share average rose more than 1 percent on Thursday, led by automakers which reported strong June sales in the U.S. market, and broadly supported by a weaker yen. The Nikkei share average gained 1.2 percent to 20,568.65 by mid-morning. The market has been pressure by Greece's festering debt c