patch 8.0.1681: the format attribute fails with MinGW

Problem:    The format attribute fails with MinGW. (John Marriott)
Solution:   Don't use the format attribute with MinGW.
diff --git a/src/version.c b/src/version.c
index f0a21b3..d162de5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1681,
+/**/
     1680,
 /**/
     1679,