patch 8.0.1744: on some systems /dev/stdout isn't writable

Problem:    On some systems /dev/stdout isn't writable.
Solution:   Skip test if writing is not possible. (James McCoy, closes #2830)
diff --git a/src/version.c b/src/version.c
index 52486ac..0c25fd7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1744,
+/**/
     1743,
 /**/
     1742,