updated for version 7.3.915

Problem:    When reading a file with encoding conversion fails at the end the
            next encoding in 'fencs' is not used.
Solution:   Retry with another encoding when possible. (Taro Muraoka)

src/fileio.c

@@ -1380,6 +1380,8 @@ retry:
 # endif
 			   )
 			{
+			    if (can_retry)
+				goto rewind_retry;
 			    if (conv_error == 0)
 				conv_error = curbuf->b_ml.ml_line_count
 								- linecnt + 1;