Add ecp_nistz256.c to list of files skipped by openssl-format-source

Reviewed-by: NTim Hudson <tjh@openssl.org>

util/openssl-format-source

@@ -88,7 +88,7 @@ do
       case `basename $j` in 
 	# the list of files that indent is unable to handle correctly
 	# that we simply leave alone for manual formatting now
-	obj_dat.h|aes_core.c|aes_x86core.c)
+	obj_dat.h|aes_core.c|aes_x86core.c|ecp_nistz256.c)
 	  echo "skipping $j"
 	  ;;
 	*)