patch 9.0.0738: cannot suppress completion "scanning" messages

Problem:    Cannot suppress completion "scanning" messages.
Solution:   Add the "C" flag in 'shortmess'. (Bjorn Linse, closes #11354)
diff --git a/src/version.c b/src/version.c
index 9a485a0..e3a6f36 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    738,
+/**/
     737,
 /**/
     736,