build: Make print statements in scripts python3 compatible.

Signed-off-by: Johannes Krampf <johannes.krampf@googlemail.com>
diff --git a/scripts/checksum.py b/scripts/checksum.py
index 8c7665d..773fa7a 100755
--- a/scripts/checksum.py
+++ b/scripts/checksum.py
@@ -10,7 +10,7 @@
 def main():
     data = sys.stdin.read()
     ords = map(ord, data)
-    print "sum=%x\n" % sum(ords)
+    print("sum=%x\n" % sum(ords))
 
 if __name__ == '__main__':
     main()