Merge #812: travis: run bench_schnorrsig

a51f2af travis: run bench_schnorrsig (Jonas Nick)

Pull request description:

ACKs for top commit:
  sipa:
    ACK a51f2af
  elichai:
    ACK a51f2af

Tree-SHA512: dfe68090fc60cba3cf2ff2f459f8ee47c4de65d28aee64310a7f7d54667daea5e82b907742445fa76b95cc2e67d57605dd260080919d8b805704784618745e29

Author: jonasnick

contrib/travis.sh

@@ -56,6 +56,10 @@ then
     then
         $EXEC ./bench_ecdh >> bench.log 2>&1
     fi
+    if [ "$SCHNORRSIG" = "yes" ]
+    then
+        $EXEC ./bench_schnorrsig >> bench.log 2>&1
+    fi
 fi
 if [ -n "$CTIMETEST" ]
 then